Easy 8 is 380mp / 140fu and completely dominates OKW Panzer IV which costs about the same. It's okay for doctrinal units to be better than stock units and force specific counters.
Easy8 is a great tank in poor commander. From a "commander design point of view" creating a equally tough medium in a better commander will simply riflemen company even less attractive.
I also compared the new Sherman with doctrinal Panzer H and it superior to it although cheaper.
From a balance point of view the unit must be compared with benchmark which is OSther PzIV.
The M4's "better AT" is neglectable (or arguably worse) because Axis tanks have higher armor values by default.
Not really because it superior to Ostheer PzIV and it will beat it 1vs1. In addition with Smoke and WP shell it can counter ATGs forcing Ostheer player to go Stug and forcing them to attrition defensive play which can be won with the Calliope.
M4 vs PzIV
Ostheer 55%/67%/78%
OKW 100 43%/51%/60
PzIV vs M4 upgraded
51%/55%/65%
The Sherman has far better chance to penetrate than Ostheer PzIV, if you take into account moving accuracy is far better AT.
M4 with dozer for 40mp / 30fu would cost the same as Easy 8 with same armor and effective HP while being slower and being (a lot) worse at AT, but having a bit better AI instead.
The comparison of dozer with Easy8 is completely irrelevant, compared with the new Sherman the Dozer is also less desirable. Not only the new Sherman comes earlier and it as durable but the new Sherman is a good in AI if not better with WP shell and far superior in AT.
There is absolutely no reason from diversity point of view or balance point of view to buff the dozer blades and there many reason against it.
If one want to see more medium tanks used by USF one has to simply lower the efficiency of the M36 vs mediums. If one want a tougher tank for the Commander one has to only move the dozer to this Commander.