Multisite as a social media portal without Buddypress

Hello,

I’ve been thinking about building social media into my multisite. I’m considering using WPMU’s plugins instead of Buddypress.

Are there any opinions as to why I should use Buddypress instead of just WPMU plugins as a “framework”?

Also, will any WPMU plugins break css the way Buddypress does?

Thanks ahead of time for your opinions.