If you insist on showing the result of a rename on the next frame, then yes, it must block the next frame until it's done. Would you write your editor that way

If you insist on showing the result of a rename on the next frame, then yes, it must block the next frame until it's done. Would you write your editor that way if it didn't use LSP but was specific to one language? If not, but you would write it that way with a language plugin, why? You still have to write a good product. You can't blame the plugin API for everything you get wrong.