Still, you need to install and run the AppImage at least once to enable the "lms" cli which can later be used. Would be nice with a completely GUI-less installation/use method too.
Those don't offer the same features as LM Studio itself does, even when you don't consider the UI. If there was a "LM Engine" CLI I could install, then yeah, but there isn't, hence the need to run the UI once to get "the engine".