Its not that amazing. The reality is that this is simply your personal taste that the waste majority of humanity wouldn't agree with you on.
Frankly, almost nobody in the world uses that type of Desktop Environment anymore. So if its so great and perfect and superior, you would think it would be more popular.
Hard to base an argument on popularity when there isn't a choice.
You have to fight hard to get access to this type of desktop environment. With the singular exception of SerenityOS, no operating system offers an easily accessible paradigm that isn't 14 shades of flat, low density and low contrast.
Frankly, almost nobody in the world uses that type of Desktop Environment anymore. So if its so great and perfect and superior, you would think it would be more popular.