Agree with most of your points.
HT weapon drop should not require base weapon unlock. Not sure why this was implemented. It was a complete non-issue before. Paying 45 muni so you can upgrade your infantry with LMGs and PIATS makes no sense when you can pay 15 fuel and get the same PIATs and slightly worse but cheaper LMGs. Not sure what the idea is behind this, to be honest.
If I am not mistaken the reason it started requiring the unlock was because it made the unlock completely unnecessary and thus one "theoretically" was getting the vehicle allot cheaper since it also bypass the need to unlock weapons.
This drop weapon mechanism has cause more trouble than it worth, (tech requirement, conscripts with 1 weapon slot, no counter weapon transfer across faction) and it should be actually abandoned imo. The Vicker K could become stock as an LMG and bren become closer to BAR.
I agree PIAT Sappers do almost the same job as AT Sections.
Main difrence here is AT section have great AI power since the BOYS are like Guards PTRS
I don't see much point in them either. Giving them camo is still not a very good idea. Cloak + snare + PIATS on the same unit doesn't seem like a great idea to me. Why heal and pyro upgrade was removed form AT sections doesn't make much sense to me either. Maybe this is again a team game thing? AT Sections have never even been regularly used as far as I remember. What was the point of nerfing them like that?
Pyro/Heal was removed due to being straight up superior to IS and having to much utility, see point above.
As I have post elsewhere imo the accuracy of AT rifles should become a timed ability with a hot the ground animation.
Boys could then become an upgrade to tommies or drop-able from HT replacing Piats (if this stupid mechanism is kept).