@jaeparku
Define perfect SFF size. Each person has it's own. For some, the perfect SFF size is 17L, for others - 4L. There are as many different tastes as there are many different people. To me personally, the original idea of 10.8L was perfect, but increasing it to 11.1L is no big deal, the 0.3L will make almost no difference. In my opinion, having alternative to M1 will be good for competition and variety. Is there another case that can support 10-11 cm tower air cooler and full length triple slot GPU in 10-12L segment, apart from M1 of course? I might consider it when going to shop for parts. So far I have found no alternatives, on top of that, this damn corona doesn't make things any easier for shopping.
I remember people also screaming about the Kolink rocket, that is basically a clone of A4 and nobody needs it. Few months later, SFF reddit is full of builds done in that case. There is also another paradox. For some reason people are fine with buying the gazillion of various knock-offs from Taobao. Life is strange, go figure.