The core issue of tank balance is that there are “certain” vehicles that are practically immortal to even 1 BR lower than their own.
To combat that, the simplest solution would be to add SPGs and tankhunters that suck in every single category - but shine in their anti tank capabilities.
Open top, no MG, bad HE, bad speed, bad armor → all these things should be considered MUCH MORE when deciding BR placements.
When a BR5 vehicle is almost immortal to BR4 tanks we have a problem - no vehicle should be vastly supperior to just one single BR level.
So again again and again → giving more love to SPGs would entirely fix this issue.
STUG III F → BR2
SU85 (not M) → BR3
M10 ( maybe Hellcat) → BR3
Firefly on TT → BR4
New M36 Jackson → BR4
New M3 GMC truck with AT gun → BR1
TT SU-76 → = BR2
New ISU 122s → BR4
New ISU152 → BR5
TT STUG A (without HEAT) → BR1
New Nashorn → BR4
If those vehicles would be put into action - the time for easy back seat tanking would be over - Tiger II H, Jumbo, Panther, KV1 would finally have to fear even lower BR tankers.
This is the easiest and most logical solution, the new reserve tank mechanic will fix nothing.
Your suggestion won’t be any better. How is adding this bunch of br4 and br2 tank destroyer have any help to the br1 and br3 player that the replacement tank intended to help? The br1 and br3 one are not that great either since the tank counterpart is 1 br higher so you may get it with replacement tank.
To make your suggestion work you will need to find td that have gun that is 2 br lower than the tank counterpart.
Lol so in the end you are talking about other issue. How is BR2 have no chance against certain vehicle related to br1? Even you change the br2 vehicle without the replacement tank br1 tank still can’t counter br3 tank. Your suggestion can only supplement the replacement tank, replacement tank won’t be obsolete because of adding td that change nothing for br 1 and br 3 player.
I mean, what can also be done is adding APC style armor that carries AT guns at BR1 - however I feel like those having BR3 guns would only work if in return those trucks got ONLY AP rounds, no HE, otherwise they would make all other BR1 tanks obsolete.
That is why I said on top, your suggestion can only supplement the replacement tank instead of replacing it.
Anti infantry is another major job for tank, most Player will not use a vehicle that can do nothing to infantry. They might just build real at gun instead.