[Rapzid]

If your entire site's React/Vue implementation is solely serving up DOM elements to other libraries perhaps.

Frequently it's the case though where like 99.99%(hyperbole) of the site is handled by React/Vue and you just need a few specific components to be controlled by an external lib. Heck, anything wrapping a canvas based lib is pretty much doing this.. Tons of component libs do this. It's very "web component" like to let something control a slice of the DOM anyway.

[polished85]

I agree that sometimes its okay to give another lib control of the DOM (D3 probably falls in this category). However in the context of the parent comment where haberman is wondering if Bootstrap could work directly with Vue (which it could) I still hold that this is missing the point. In this case Vue would be nothing but a glorified templating engine. I would rather only use the boostrap styles while writing my own logic with Vue's reactivity model.