Untalented 109 pilots like me need the gondolas - bad.

For us, the extra performance doesn't mean much, since if we gonna be shot down by somebody, we'd be shot down anyway.
It's like the "Nike" shoes.. or maybe the 'aerodynamic suits' the 100m track runners wear... they put in all kinds of stuff and technology into that one shoe or suit.... experts like Carl Lewis or somebody might feel the difference by wearing that shoe or suit, but to a normal joe - it's just another expensive sneakers, and another funky hooded T-shirt
The gondolas provide a generous amount of chance in taking shots without needing to have wory 'ooh... I'm already under 100 rounds in 20mm????'. The untalented may get a chance at someone's six, but usually our gunnery doesn't catch up with the chance provided, so we blow it. Waste 60-70 rounds just to ping that guy once or twice. It's there the 250 extra 20mm rounds kick in

Hey, I've got 400 rounds of these babies- oooh !
Survival comes later, since our usual option is to just run straight home, and most of the times, this is successful. Gondola'd G-10s still outrun the Sputfires and N1K2s
I think that's why the Luft Waffe actually evaluated the 190 as 'easy and simple to fly and fight in, compared to 109s'. Planes with lots of ammo load helps the rookies - a lot.