I've been with Proton since the early days but after seeing hey.com, for the first time I'm tempted to switch.

Both e-mail and calendar UX look awesome. That is, I wish I had every single feature they demo on the homepage (video).

Has Hey caught your attention too? Can you see the Proton's web-mail adopting those features? Or is it something that could be built as a generic IMAP client, hence as a client of Proton Bridge?