Correct, but they're very bad experiences compared to the native clients. Skype for instance (last I tried) didn't support screen sharing. Web Spotify won't let

Correct, but they're very bad experiences compared to the native clients. Skype for instance (last I tried) didn't support screen sharing. Web Spotify won't let you listen to high quality audio or listen to local tracks. Office Web won't open or properly format large documents. Evernote's web UI (granted, as of 2014) was borderline unusable.