Comment by barrkel

LSP is sensible for the same reason that the middle end in a compiler is sensible - it turns an MxN problem into an M+N problem.

For compilers, M is source languages and N is target platforms. For LSP, M is source languages and N is editors.

They both have the same downside. The more esoteric the language feature, the lower the fidelity of support in the common middle.