As I said, I am probably the least qualified to talk about Pakistani Army capability, I know probably just above nothing on the issue, and the stuff that I do know is overdue by 20 years.....And even if I do think I know, I wouldn't speculate after how many people, including me, got the Ukrainian and Russian capability wrong, and I studied quite extensively both Ukrainian and Russian military, I even have friends that are high ranking Ukrainian military official....
Anyway, you will need to look at the function of Mech Inf both offensively and defensively. Their use is battlefield is actually quite limited, you either use them to try to outmaneuver your enemy in offensive term or use it to plug gap or act as a mobile reserve if you are to use them defensively. which again it comes down to how PA think they can support their troop in the field, if they think they can sustain it while conducting an offensive operation, then yes, they should be properly armed with heavy equipment with weapon platoon, but if PA think they can't and use their Mech Inf to do hit and run (like Area Denial duty such as mining the road, or cutting off enemy retreat,) Then they will be more geared toward Light Inf role.
It's like Airborne forces, the West opt for Light Infantry Role for their Airborne force because you don't expect to fight behind enemy line for a long time over a sustained period. then they don't equip the airborne troop with heavy equipment like armour or even crew serve weapon. However, in the Eastern Doctrine, VDV and Chinese Airborne are used mainly as mainstream infantry, which mean they are to equip with Light Tank or even full Armour like T-72.