Multisite as a social media portal without Buddypress


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.