I think the issue here is that Apple’s own Pro Display XDR stands a cut above the new iMac in terms of appearance. And while that device doesn’t have a processor in there, it’s over twice as thick as the new iMac. So it’s not unreasonable to expect Apple to have designed a chinless iMac at the cost of thickness.
As for stickers, I’m remarkably surprised by how often this comes up. I suppose the chin does have its advantages after all. There’s no harm in constructive criticism and wishful thinking if they give companies a better idea of what its users want.