If Gen 4, 3, or 5 work for you, carry the **** on.

I still have Gen 4s G19s but also have a G45 (which has Gen 5 features).

I will likely get a Gen 5 G19 without the grip cutout at some point because I like the way the G45 feels, but I have never felt the need to follow the lemmings off the cliff after every last new thing released by anyone.