What? You have to run Bridge on your desktop to get the functionality anyhow... if they offered it natively then it might be worth something but you have to run a binary to get it. Meanwhile Proton's mobile app has gotten buggier and buggier over the years as it refuses to load messages, loads old messages in a thread when you click on the most recent notification, forgets to remove drafts after sending, fails to sync the calendar, etc.

Lumo, which could have been a great offering, similarly breaks after every fifth message or so and is substantially behind SOTA offerings. IMHO Proton has jumped the shark and this is just the final straw.