No it wouldn’t.
It wouldn’t even solve what you want:
This is a mathematical minority of vehicles.
You might think it’s 40%, I might estimate 15% at most, either way, it’s not a majority.
Yet you demanded that we decrease [compress] the BR matchmaking range earlier in your own post.
Decompression doesn’t reduce variety.
0.7 makes many vehicles impossible to balance.
Point-in-case: Tiger 2, Tiger 2 105/T29, IS-3, and IS-4M/Maus.
4 similar but different vehicles. Perfectly balanced in the vastly superior uncompressed matchmaker range.