There are now at least a dozen calendar reformists edging on posting a rant about this lol.
Worth noting though that this has mostly stuck around because any attempt to switch to a more divisible week structure is met with resistance from Christians and Jews since going off 7s messes with their calendars.
Of course you could use just two liminal days inserted outside of the standard month or week and basically have a calendar where holidays stop jumping dates.
“Gramma wasn’t no pussy sonny!”