You get 3 lee enfields which will basically tickle lategamr axis infantry, and 2 piats that will most likely just miss a moving target if all you do is mindlessly blob them around. Not to mention tommies' out of cover debuffs which hit piats especially hard, with either -40% or -60% reload speed. Putting at on sappers or rear echelons is actually much more cost-effective and worth it.
The problem in the live version, in 1v1 and 2v2 at least, is that you can simply double bren your bolstered tommies and gain map control because no allied infantry can stand against it (maybe vet 5 fusiliers, but it takes a while to get them there). This means that you will get a lot of fuel also. By the time a Panther comes out, which can do nothing against infantry, a comet is already happily running around. A single at gun and one sapper squad with double piats can easily scare of a Panzer IV.
Not to mention allied artillery dominance with turbomattress and CalliOP. Good luck keeping your vetted infantry, which is basically always outmatched after 5 minutes, alive vs all this madness, let alone your tanks.