This is exactly what mobile apps are as well though. All apps today are thin clients utilizing a remote backend
Only about half of my most used mobile apps are used online let alone 'a thin front end for remote backend'.
Bear, Obsidian, Camera, Activity / Health, Things, Photos, Pixelmator, Hue, Music, iMovie, Home, AiWriter, Prompt, Water Minder, Yomu - I use all of these primarily offline / locally.
Even the apps that are very much for use with online services aren't simply thin wrappers - they're proper applications that fetch remote data when online, store and process locally - Podcasts / Overcast, Reeder, Mail, Working Copy, 1Password (7), LunaSea, Audible, Plex etc...
And if I think about what the apps on my phone that are closer to "thin" clients - IMDB, Goodreads, Banking, LinkedIn, Amazon, Slack etc - all of which are pretty janky compared to those previously mentioned.