Its fine
it already got a price and buildtime increase
if anything maxim need to be 4 man
Unless you're buying at least five of them, then cost increase is 100% offset by bonus starting menpower.
Build time increase is irrelevant, because first one requires less time to hit the field and 2nd one arrives at pretty much the same time as before due to standard menpower limitations of early game.
Its still cheaper and better at literally everything then .50 cal.
Just wanted to put that here for you.