Firstly, the views on MTOW being some sort or regulatory annoyance is scary and a safety issue.. Secondly, on limits, there needs to be some so there will need to be a line in the sand, don't like this? ATPLs and a A380 endo are available to all with enough $ and time. MTOW in both RA and GA as mentioned will be a limit to one or more factors which usually won't be structural of the fuselage or wings but may be stall speed limits GA has these also dependent on CAT, performance, GA also has this , and many others I'm not too aware of
Just because the wings don't fall off, doesn't mean it can't kill you