I think in your first paragraph, you meant Celsius? With the 0-100 comment.
Anyway, is not really being selfish, it’s that most people don’t know or don’t understand what they’ve not been taught, and an argument could be made that "it’s too difficult"to switch. Same reason we have MPH not Km/h, 12 inches = Foot vs CM or M. Or pounds (Lbs) not kilograms.
I would love to adopt that system as its more intuitive to understand.
I also like the argument of 13 months at 28 days each for a solid Sunday - Saturday approach. Yes, that only = 364 days, which leaves 1 extra each year plus leap year. I day those are called bonus days, where everything is truly shut down for a time to be together, rest, enjoy, etc. Don’t make it a big holiday where travel is involved as that requires fuel stations to remain open or grocery stores to operate. Anything like emergency services and whatnot get paid 3x holiday pay not just 2x.
OK one last thing. Fix the goddamn month names!!! Storyteller should be 7, October =8ty, etc. But somewhere along the lines I think we’re aged July and August so those got pushed out of sync two months and so December meaning 10 is more 12 lol. But we all go along with it because of tradition and history. Not stubbornness or selfishness.