Colt didn't introduce the AR-15, either. That was ArmaLite, who then sold the rights to the design to Colt.
Any of the suppressor manufacturers.
Ultra long range bolt guns from a variety of manufacturers (notably not Remington, colt, etc).
Several novel application PDW systems (personal defense weapon). B&T, FN, Sig, HK, and others.
Optics have rally stepped up. Always on 8 year battery life 300ft submersible red dot sights from aim point. Crazy precision scopes from vortex, nightforce, a few others.
It’s certainly a hobby that you can spend $100k on really easily exploring a variety of styles of defense and sport shooting.
The FCU concept would still have value were the legal framework less Byzantine, but its practical benefits would be significantly diminished.
It's also worth pointing out that while the manufacturing techniques used by Glock were new the actual design is essentially identical to the browning hi-power.
BHP is hammer-fired, Glock safe-action is striker-fired.