Yeah, I agree. Only thing is the trademarked stuff, for example you mentioned Nike boots... that wouldn't be easy to do if there were official first-party support from SE. Not only because of the trademark display (Nike sure wouldn't care) but because of the value of displaying that trademark. SE's finance department simply won't give away millions of dollars worth of advertising for free.

Of course first-party support would also mean they have to make sure the submitted mods adhere to FF aesthetics, quality, etc., but a simple review process would filter out those that aren't up to par. I can say with surety that there are many, many mods out there that would instantly be accepted and supported. The artists that do some of these mods are absolutely amazing and hugely talented.

I haven't used any myself, yet (?), but simply browsing pictures of the drastic quality improvement on some of these (hair, body features, etc.) blows my mind, LOL. Good stuff.