As far as the flamethrower tanks are concerned their range is disproportionately long in comparison to the map scale and other tank ranges. Their use is somewhat gamey.

I don t know what the idea was with the phosphor grenades, given that quite a few player
even already hat mortars let alone these phosphor grenades that render micromanagement of infantry units useless since they get killed anyway. Whilst the use of rockets at least costs the player a considerable amount of points phosphor grenades are just a cheap way to destroy any infantry gameplay and entice noobishly just shoving new squads in.
Immersion gets destroyed for me when infantry is meaningless and just there to be replaced.