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.
Main difrence here is AT section have great AI power since the BOYS are like Guards PTRS
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).
You should check the DPS of the Boys AT Rifle. It's slightly worse than Guards PTRS but has only around 35-40% of the DPS of the regular lee enfield rifles. So no they don't have great AI power and no AT sections with heal/pyro are NOT better overall than regular Infantry Sections. They are way worse against infantry as they should be.
Not sure where you come up with stuff like that. Guards are a decent anti infantry unit because of the LMGs and the Mosins, not because of the PTRS. Yes the Guard PTRS is better than the Penal PTRS against infantry but that doesn't make it have "great AI power".
Locking the HT weapon drop behind base weapon racks makes no sense as I said before because of one simple reason: getting doctrinal weapons with Supply HT is less cost-efficient than just getting regular weapon racks. PIATS are the same and the difference between Vickers K and Bren is not big enough to justify getting the HT and then paying 60 muni instead of 45.