It’s not a debate. It’s very much amplifier specific.
I have ICEpower amps and they absoultely need at least 72 hours to sound musical.
My Luxman warms up well in half an hour.
I have no real explanation for why some amps warm up faster than others. I do not believe this has anything to do with the amplifier class (A, A/B or D) either. I do think it probably has something to do with the capacitor types, and maybe how much power they draw at idle. Perhaps the Class D amps, being low power, take a lot longer to warm up because they literally don’t warm up?
I’ve also heard say certain megabuck amps simply don’t sound good until after 48 hours at least.
I think it’s very much specific to the amp.