They are fine. They've been fine for quite some time now...
And there were only 40 Ostwinds throughout the war but I see no one complaining about it. PzB would solve the problem completely.
Actually lots of people have had that specific complaint.

Why a game representing 1944 has KV1, Ostwind, Stuart and Luchs over vehicles like non-doctrinal T34/85, Wirblewind, M24 Chaffee and Panzer III is a total mystery to me.