[Imp]

I understand what yo are saying but feel you can pretty much work round it with the filter & it would not impact my play style much.
Hardly use the filters but it is handy more so in MBT.
If tank is near to infantry reduce his range to engage them based on when RPGs are dangerous. Now they are close & becoming a threat so use everything you have with a high hit chance & not getting distracted firing at distant infantry. Yes I have not used my MGs but thats a good thing because I have saved shots incase vehicles & air turn up. This means I can protect my troops & APCs if something dangerous turns up & hes free to pinn everyone in my turn. If there are no major threats left out there meaning I don't need him to save his shoots then I have no need to save HEAT either.
Infantry are the same if you have a long range RPG like the 7 consider turning down vehicle engage range to 5 or 6 for better accuracy, less if ambushing. In my experience RPGs are rarely wasted firing at trucks as normaly other weapons have caused a bail out.
As a thought & no idea here but if I was in a tank tasked with giving infantry support & did not use everything at my disposale to do it the infantry would have every right to be pissed.