Not so. Consider:
The 109K-4 was introduced into the game as a G-10 with a 20mm option and gondolas. It was a K-4 in every way performance-wise, and the only reason it was called the G-10 is to add 2 planes into the game at once, because there wasn't much of a representative lineup.
This was a way of beefing up the planeset and the options when there were still only a few of them.
You'll notice that as the planeset is flushed out, the inaccuracies are remedied.
Further, consider:
The VVS planeset has been stagnating for a while. We've just received 2 USAF aircraft used in large numbers by the VVS (P-39s) but on the whole you have LA5/7 and Yak9T/U. That's really only 2 planes with 2 variants each.
As soon as we start getting early yags, laggs, migs, whatever, and as soon as the planeset can hold its own, the 3-gun option will probably be revisited.
P.S. Don't discount it as a perked ord option, like the c-hog is intended to be. They may have left it in for a reason.