For me, it would be mandatory to show your cards on the river if you call a bet and lose. Example, if villain bet, and you called and lost the hand, you couldn't muck the cards, and would have to show what hand you called with.
I would like to change the example if on the flop your percentage is greater than 90% probability of winning the hand it ends at that moment to avoid tragedies
Of course everything is long-term beloved in poker, that's why the game is working.
I was wondering back in the days that why the kicker plays when yout have Set and Quads, and why doesn't when having Full-House. Also it's not easy to follow the chop-pot when the value of the hands is going to be equalised by the kickers.
But these two also make sense as well.