Am also using Xcode but not experiencing crashes, so it could be to do with his environment. I've got Xcode running now since.. 2003? It's not always been perfect but pretty stable if your env is right.
I do imagine Xcode is stable so it's mostly a suggestion to making testing on an actual device more convenient. I imagine for somebody who already have a proper pipeline it doesn't matter but here it doesn't seem to be the case, hence offering an alternative.