I have nraas, smooth patch, sims fix, and other default replacements in my mods folder, and during loading screen, it crashes!
I tried deleting cache files, modifying files, and other methods. In the end, I gave up and deleted The Sims 3

Forgive me, but I am a little puzzled here. This is a Game Help forum, yet you say you have given up and uninstalled the game (I think)? Are you venting or asking for actual assistance?

If the latter, the latest versions of the Smoothness Patch are not compatible with NRaas. We're pretty open about it if asked. Afraid I don't know what "sims fix" means or where it comes from, perhaps you could expand on that a bit more. There is also a small number of NRaas mods that alone will crash the game on startup if the content they are meant to manage is missing or not loading correctly, but that's usually pretty easy to spot and fix.

This game is old and fussy, like many of us who still play it are. Not everything designed to help it along actually helps or works well with other such things when used all at the same time. But unless you are playing a less than legitimate version of the game or are on totally unsuitable hardware, there are plenty of us still around willing to help you get your game into a playable state again.