During any phase of ground assault on enemy positions, own ground forces are supported by artillery as well as air support. Artillery is used for suppressing enemy so own infantry can reach as close possible as possible to enemy positions without taking enemy fire and get enemy within range of small arms fire including assault rifle, LMG, RPG etc. This also ensures that own infantry can assault enemy positions from multiple directions without getting detected. Pakistan's Artillery arsenal is adequate for fire support and its very very effective. But Artillery has its limitations since artillery has difficulty taking out moving targets, at rare occasions it cannot achieve required trajectory etc. Due to experience In past wars, PA shifted Mortar batteries into Infantry battalion's weapons platoon. This gives much needed indirect fire to infantry assaulting enemy positions using 81 mm or 120 mm mortars in some cases.
Strikes by Aircrafts are extremely effective, much more than effectiveness of artillery at times. They have longer range than artillery, they can carry different types of missiles or bombs, they can undertake different types of missions like interdiction, strategic strike, tactical bombing etc. I can give an example from 1965 war between Pakistan and India. PAF F-86 Sabre flew into Indian airspace and targeted an Indian Army reinforcement convoy heading towards Lahore sector. PA ground forces which were out numbered near BRB canal dug in and prepared a defensive line against IA attacks. Had these Indian reinforcements reached Lahore sector, history would have been changed. This is something Artillery cannot do. Then the specialized weaponry that aircrafts carry, like missiles and bombs, are used to target different kinds of weapons. Bombs are used to target enemy positions, ammo/fuel dumps, bridges etc. Strafing with 23 mm or 30 mm on lightly armored vehicles like trucks can reduce convoys to dust within minutes where as missiles can take out enemy moving targets like MBTs, IFVs, SP Arty, SP AD as well as prove useful in DEAD Ops after which Gunships can be sent in to mop op enemy armor.
Mirage-V can carry all sorts of bombs and missiles, long range- short range, its a perfect aircraft for any type of ground strike operations. F-16s are tier-1 fighters, so their availability is skeptical for PA, but they carry a very important missile - AGM 65 - which A-10 in USAF uses effectively against Enemy Armor like MBT/IFV/APC etc. If im not wrong, an F-16 can carry 6 x AGM 65 per sortie. PAF could have kept flying A-5 and seconded it to squadrons supporting PA in strike roles, since its difficult to spare Mirage-V and F-16 for PA operations.
Feb 27th 2019, PAF sent in Mirage-V strike aircraft to drop bombs near an enemy Brigade HQ. This feat couldn't have been achieved by PA Artillery if it was tasked to take out an enemy Brigade HQ. In Military, If a Brigade HQ is lost along with its staff, the coordination between Battalions and Division is affected. Brigade Commander is not the only POC, the G-1 Staff officer attached from Div HQ and most importantly Brigade Major and Brigade's G-3 Staff officer who are coordinating with battalions are lost. The Divisional Colonel Staff will have a hell of a time reaching all battalions for report and progress. Basically the load will be shifted on to Divisional HQ, which will already be handling 3-4 other Brigades. This is the reason PAF decided to strike near Brigade HQ, to let India know that Pakistan is capable of taking out critical staff in Indian Ranks who are responsible for operations from Indian side on LOC. Obviously, PA would have requested PAF to vector in on IA Bde HQ, to send this message across the border.
Simply put, PAF sending in aircrafts for ground strikes on enemy positions saves lives of PA soldiers on the ground, it also minimizes the time and effort taken to capture a position. This is what Blitzkrieg was all about - Stukas and Panzers. Gulf wars are examples. For an Infantry soldier, there is an effect of morale when friendly aircraft show up in the sky. There is an effect on morale seeing MBTs as well as Commandos showing up on battlefield for an infantry soldier, but when the aircrafts arrive, the theater commander as well the ordinary soldier knows that the task has been made easy, these aircrafts will bomb the hell out of enemy and pave the way for advance. In 1971 war in East Pakistan, SSG was sent everywhere with PA Infantry, because of morale boosting, but the lone squadron of PAF could not do much to blunt IAF attacks neither proved effective in combat.
Regarding Navy, PN is very small compared to mammoth sized IN. Its very difficult for IN to conduct offensive operations in Indian waters. yes submarines is an option for PN, due to their stealthy nature of remaining submerged, but IN has acquired submarine hunting aircrafts like P-8 which can pose a threat to PN subs. To bolster PN's strike capability as well as giving PN a chance to stand against IN in the event of war - PAF's air support is extremely important. IN has acquired Naval Mig-29's and it will be supported by SU30MKI and Rafale in future. India knows it has edge in Navy, so IN will exploit it fully. This is where 12 x Mirage V of PAF's 8th Squadron are found out numbered. Exocet is an excellent missile but Mirage-V will need to operate under air cover - so will ATR-72 and P3-C Orions. 2nd Squadron of PAF comprising of JF-17 will support PN in Naval operations, but its classified as MR (Multi Role) Squadron, which means its role can be shifted from Maritime Operations to AD or AS even., leaving behind 8th Squadron as dedicated Naval support squadron.