I mean, you'd never sit down with friends and play roulette or blackjack or any casino game just for fun, right? It's be incredibly boring because you have zero choices and without the thrill of money being on the line there is no reason to play them. I wouldn't even put them in the 'game' category. You may as well flip a coin over and over. Even card counting BlackJack is just game of not getting kicked out by the casino -- counting cards itself is simply memorizing a table and has no choices either.
I've always been mystified people can spend hours in a casino playing the least interesting games I could imagine.
Poker is the lone exception. Poker with friends for trivial stakes still good. I can think of plenty of games with similar variance so beginners would always do reasonably well against experts and they'd still be be a million times more interesting than everything else in the casino.
You'd think with all the money in the gambling industry that some effort would be put towards making the games themselves intrinsically better.
Could you open up a 'casino' anywhere that instead used games that were obviously skill based because it woudn't be considered gambling? Poker is one of the most popular casino games and it's also the only game of skill Why not more?
tldr: Why are Casino games so bad?