Pakistan is broke and war costs money. Unless China bankrolls the Pakistani military they cant afford war.
Not much 155 mm ammo used on LOC or in WOT. The CODs still have them waiting to be expired. That means guided and unguided projectiles. The towed 155mm regiments are also placed in the east.
That solves the ammo issue.
M-109s and SH-1 have been acquired in large numbers to assist raising of more mechanised and Armored units which have been assigned to infantry and mechanised divisions which means the POL ( petrol oil lubricant) quota of these divisions has been increased many folds along with providing them support wksps of EME and more logistical support such as tank carrying long flat bed trailers.
SH-1’s ammo range is longer than M-109 so even though if regiments transition from towed guns to SP guns, it’s shoot and scoot ability may or may not be exploited under the infantry/mechanised divisions of holding corps. It does however give an advantage to Armored brigades due to its capability of keeping up with the mobility of tanks and mechanised infantry’s APCs to launch proper Armored offensives which an Armored brigade is supposed to undertake while the brigades had been hindered before due to support from towed howitzers regiments for which the shoot and scoot ability of towed guns and trucks was rehearsed in every excercise for infantry divisions. An Anza SAM can be carried on an open truck with a crew but a towed howitzer cannot become SP by simply tying a gun on top of a truck.
That solves the SP Arty availability issue as well as fuel, spare parts and maintenance issue along with combined arms Ops of MBTs, APCs, SP Artillery snd SP AD.
The new form of recon is from skies through UAV as well as guiding fire onto enemy units, while ground based FOO is redundancy in case UAVs get shot out of the sky.
The brigade commander and the top echelon has to depend upon the Armored brigade to provide the punch for infantry to breakthrough so no excuses for staff HQ of all formations this time.
I think something else is bothering you.
Pakistan army already has sufficienct weaponry for credible deterrence. Why does it need more weaponry ?
The sister infantry divisions of Armored divisions want to trail along with MBTs, so now their guns got wheels.