AKs and Galils, I'm 100% good with 45 degree cant and charging over the top. But I can also shoot FALs, G3s and other left sided guns. The FAL has to be a non reciprocating or else you would constantly hang it on barricades.
A lot of the new gee whiz gun features are for those who never learned how to run a practical rifle in the first place. If you can't left hand charge your AK it's because you haven't been willing to invest 8 hours into learning how to do it.