[patrec]

LSP provides the bare minimum semantic support (navigation, completion, inline error annotations and basic refactoring support) to make emacs or vim worth of consideration for serious coding at all, and only because the inferior code understanding both have even with LSP is often more than compensated by other advantages such as being able to work in a terminal compelling plugins like magit for emacs, or, at least in the case of vim, general snappiness. I like and use all three, they all have their pros and cons, but saying that LSP (via LSC or one of the other myriad of lsp-support plugins) is about as true as saying that Jetbrains + Vim plugin lets you do everything you can do with VIM.

BTW: emacs does in fact have a debugger: GUD (with a bit of tweaking, it's bearable, too).