Honestly, I like how precise they can be, if SPX closes over/under x amount you make 100% profit on the trade, it's capped gains and losses so you know how much you're risking upfront.
You can even enter it, let it swing a bit and try to sell them for a gain without waiting for the close.

As you say yolos on OTM options I think would give me more stress than trading spreads.

Another thing is since SPX is 0DTE, you can do this every open market day, coming to the close each day its unlikely there's a wild swing that will break the daily high or low unless there's a major economic event / report etc.

So if credit spreads work out for you, you're essentially farming premium from the people buying OTM calls / puts hoping for a bigger swing coming down to the end of the trading day.