You can provide vscode, vim and emacs all in some web interface, and those are plenty good enough for those use cases. Choosing the plugin list for each would also be a good bikeshedding exercise for the department.
By IntelliJ's own (on-machine) standards, Gateway is crap. I use the vi emulation mode (using ideavim) and the damn thing gets out of sync unless you type at like 20wpm or something. Then it tries to rollback whatever you type until you restart it and retry. I can't believe it is made by the same Jetbrains known for their excellent software.
Even IntelliJ has gateway