Flying inverted should have nothing to do with moving on. Especiall when it's in a trainer with typical dihedral where it's a PITA. If you can handle that in a trainer, flying inverted in something better will be no problem. Flying iverted is just one more area to check off. I have no use for flying inverted, so I don't, doesn't stop me from getting whatever plane I want.

Flying iverted does not lessen my skills as a pilot which is probably why i end up with the same number of planes at the end of a season as what I started with.