You have to be sarcastic. Thats just a nonsensical generalization. Far from all mods are broken shit just as far from all DLCs are polished. You have stuff like Enderal when it comes to mods and I hopefully dont have explain to you, how unpolished and simply broken many games are, let alone dlcs. There is a giant list of games which are only playable after years and years of community patches, made surprise surprise mainly by the modding community. But thats if modding is possible. If not you are left with the shitnugget you preordered.

Yes, there are good quality mods out there. But they sit on top of mountains of shit. You can’t point to the top of shit mountain and say “see, look at how good it is”

I can and i will if you say "across the board"

The better the "mod" tools the higher the quality of the modifications and additions. Also the simpler the game the easier it is to make such modifications. Many of the minecraft mods were vanilla level quality.

If that is the case, the the end goal should be a marketplace to sell mods, and the company can move up the food chain. Basically the sims works this way.