Must have TS3 mods?

I would want to try AM, Zerbu's career mod, Vector etc for instance.

I read this though, which made me curious:

"*New addition here: Mods can alter, overwrite and/or otherwise change code in your game (and it's possible, that the could change other code on your machine) and the alterations that they make could persist, even after you uninstall them. The functionality of our content (premium content, furniture and clothing content) is heavily and complexly intertwined with our game code, and not always in ways that are obvious. This is why it is very important to trust the source of your mods and fully understand exactly what is happening when you install and uninstall them."

https://forums.thesims.com/en_US/discussion/537438/responsible-modding-an-oldie-but-a-goodie

And I don't think I fully understand yet.

Thank you @igazor, that was nice of you. Yes, they might have been referring to malware yet again, and to simplify it for the common user of this forum.