I think this is compensated with the fact you get mark target, easily accessible non-doctrinal mines, a superior AT-Gun and heavy tanks.
Shermans have A superior Tank destroyer in their tech tier, Immobilizing non doctrinal mines, Non doctrinal bazookas, AT guns with 70 range and better reload(penetration if you pay the munitions price i believe) And a very powerful anti tank strafe from airbourne. USF tanks can even cap points, repair crits and the tank at a moments notice.
But these aren't even reasons that are most important they are secondary, Simply but The T34s 10 fuel cheaper price cannot possibly be justified when compared to the sherman who outperforms it in literally every statistical category without even using HE rounds, don't need to even toggle to beat a t34. Then has multiple abilities such as smoke, Pintle mgs and better vet abilities. Sherman wins and wins hard in every quanitifiable category for more than a poultry 10 fuel and 30 mp can justify. Except speed t34 is .1/6.5 speed faster than the sherman so to be fair that may make "feel better"