It's not that plugins are portable. LSP allows any editor that supports the protocol to provide language support (using a backend "language server" that is edit

It's not that plugins are portable. LSP allows any editor that supports the protocol to provide language support (using a backend "language server" that is editor-agnostic), so it is not that hard for most editors these days to provide good intellisense/syntax-highlighting etc. that used to be limited to commercial-grade IDEs.