I had something like the AMX 10 RC or the
M1128 Mobile Gun System in mind. Something analogous to these systems will do wonders. They can run in circles around any Indian tank and knock them off the battlefield quicker and efficiently than the Type-85s and older tanks Pakistan operates. Especially in Punjab and Sindh. Maybe
@Bilal Khan (Quwa) can provide a perspective as to why this option hasn’t been pursued
Light armor on such wheeled platforms is an issue. Adding more armor will affect mobility.
PA will send MBT in direct combat to make contact with enemy, so the crew is saved and more chances of putting a damaged/partially destroyed MBT into action. like this example of AZ, if you know its history.
Sending any other platform to make direct contact with enemy whether wheeled (stryker/AMX-10 types etc) or light armoured IFV/APC (M-113 variants) is not suitable. Even the US Army doesn't put a 120mm smooth bore gun on Stryker, such as M256 which has produced good results and is a decent gun for TD role.
Tank vs tank battle cannot be avoided but T-85 III with its 125mm gun can give hard time to T-72 or T-90. T-59 and T-69 can stand their ground through proper strategy in battle if encountering enemy MBT's. The L-7 gun has low penetration (compared to 125mm), specific 105mm sabot rounds have higher penetration but at small ranges than normal (less than 1500m). Such ranges are possible in northern punjab and southern kashmir due to natural obstacles and semi-hilly terrain.
In saying that, the T-59 and T-69 are mostly used for infantry support. They are not usually expected to specifically combat enemy armor, which is the job of ATGM teams, whether armored/wheeled/dug in.
Desert is a different story where combat at longer ranges (2000+ m) are expected so MBT's armed with 125mm gun like AK, T-80 UD are used, which have better penetration using niaza rounds.
It was a trend in WW2, where as putting a high velocity bigger calibre gun on a thinly armored vehicle produced good results but nowadays ATGM teams are excellent Tank destroyers due to many reasons, firstly because they are defensive weapons. All platforms are cheaper to operate and light in armor giving good mobility. The light armor is compensated with ambush and camouflage techniques (such as used in defensive/dug in positions).