What about early, mid, and late 1943 setups in the FSO, AVA, SEO, and snapshots where you need to pit a 109G-6 against early bombers. The 30mm (not representative of this time) prohibited using the G-6 most of the time and usually G-2s were wrongfully substituted in a number of setups, simply because it didn't have the 30mm option.
The 30mm was left off because it kicked the entire plane into a later time frame, creating a large hole in the planeset with nothing between the 1942 109G-2 and the 1944 109G-6. NOW, with a 20mm-only, 1943-version we have a more representative planeset. If we need to use the 30mm we can use the G-14, which is more representative of a later G-6 anyways (MW50, but not an /AS).
It's a good thing our G-6 has no 30mm. Also, since the 20mm has *finally* been bumped to include 200 rounds it is more than capable of holding its own. I've repeatedly taken down an entire formation of B-17s by myself using only the 1x20mm (200 round) option. The 20mm/30mm weaponry doesn't change the overall effectiveness of the fighting craft itself, because you can get tons more killshots with the 20mm due to its ballistics and firing qualities, instead of fighting for a single crossing snapshot with 30mm.