What kind of rule changes have you folks tried at your tables, and how have they worked out for your games? Good? Bad?
Two of the houserules I implement for every campaign I run:
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No multiclassing until after 5th level, and no further multiclassing unless you have at least 5 levels in all your existing classes. I do this for two reasons, the first being to ensure that every character has access to extra attack/third level spells and slots/some other equivalent before they start dipping elsewhere, and to keep the munchkins at my table from taking multiple 1-3 level dips into classes just to set up a niche wombo combo. Even then, I’m pretty stringent on what I’ll allow from a storytelling perspective - I want to know what motivates your Paladin to dip into Warlock besides getting to use CHA for attack and damage modifiers.
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Instead of an ASI or a Feat, every ASI level gives a +1 and a feat. My players and I like this rule because it allows them to pick something fun at those levels instead of feeling obligated to dump straight into the primary stat, and encourages grabbing those fun half-feats like Actor or Linguist that would otherwise go by the wayside.
Personally, I forgo rolling altogether because the requests to roll stats tend to come from the players who want to minmax, and I allow plenty enough of that with the feat rule I described above.
If you have a table that absolutely insists on rolling, have them roll together and use the same array for every player, then nobody but the DM can complain about someone’s character being OP lol.
True, I strongly agree that most players should avoid rolled stats like the plague. High power level campaigns are not for the feint of heart. They are extremely difficult to play, let alone DM. Designing an encounter to go head to head with the party’s builds is not an easy task, despite the DM having virtually unlimited power regarding the game rules. Both the players and the DM must have an extremely high understanding of the rules being abused. But at the end of the day; when everything becomes overpowered, nothing is.