[CSDude]

I liked the UI because it is compact. I know they are not the only alternative, but I hate default padding and margin values of Bootstrap. Not everyone has retina or 4K displays. It is more suitable for desktop application where you need many components to be displayed, and you have a mouse to navigate. Bootstrap is good in the other way around.

[smrtinsert]

Yeah bootstrap doesn't really have an enterprise look to it. Arguably the enterprise look is uncool though, so that's not surprising. wrapbootstrap has stuff that almost bridges the gap, erring on the cool side of things though. I doubt most enterprises want something that sleek looking.

In short, make your enterprise software look like the Microsoft suite of the day and you should be ok. I think Extjs fails in that regard, it used to look fresh though.