Not so much, we don't... Outside of a few exceptions I think most of the planeset is fairly representative.
There's an effort lately to revisit these armament options as planes are updated with newer 3D models. See the SpitVc reduced to SpitVb. See the 109F4 removed of gondolas. See the early 1943 109G6 with no 30mm option.
The emphasis is moving towards more representative loadouts. It's a clear trend in HTC's decisions over the past several years. I hope they stick with it.
]
Sorry, you're wrong. The Spit Vc to Vb had nothing to do with the Vc being rare, as it was the most common version of Spit V, it had to do with getting an earlier Spit V. Same goes for the Bf109G-6 losing its 30mm, nothing to do with how common it was on G-6s and everything to do with none being on early 1943 G-6s.
The La-7, probably the most obvious example, retained its three B-20 cannon armament when it was updated, despite being updated well after the Spits and 109s.