Really depends on how they're being used. If they're independently managing their own parts of the DOM, it can work (though still a dev headache imo). If its

Really depends on how they're being used. If they're independently managing their own parts of the DOM, it can work (though still a dev headache imo). If its a "react app", ie react is managing the entire dom, having two representations of the dom is a v bad idea in that one can make changes that the other is unaware of. Or visa versa.