You’re essentially asking for the M1’s to receive the ability to roflpen it’s opposition.
That’s asking for major trouble because other nations will want the same treatment and you’re back to square one.
Firepower is just fine as it is.
You said that the firepower isn’t sufficient because you have to aim for weakspots.
Aiming for specific parts of an opposing vehicle is a core gameplay design of the game, there are very few vehicles with the ability to lolpen anything they meet, and they have significant drawbacks in other categories that compensate for this.
The M1’s are easily strong enough in other categories where the ability to lolpen opposing tanks simply wouldn’t be fair.
Stuff like the T-90A, Challenger 2 TES, Ariete PSO, Challenger OES, T-72B3, etc. are vehicles which don’t stack up well to their competition or don’t suit the META. I can understand complaints about them, but not the M1’s.
That being said, I’m all for the remaining nations to receive vehicles on-par with the Leopard 2A7V and Strv 122, that includes the M1A2 SEP v3, but that doesn’t mean I believe the current M1’s in particular need more buffs or are unique in their suffering when matched against the aforementioned Leos.