I had tried to move over from Google for email and calendar, but Protonmail's calendar isn't ready yet for my needs. Full-time job, startup, volunteer and personal commitments -- I haven't found a calendar app that can manage all this with customizable app and email alerts, search functionality, and daily email digest.

That's exactly what they're becoming though?

Well i think Email Calendar and Contacts have to be one product, otherwise Outlook will be always on the winner side, but VPN...well it brings probably more money in than the other Products combined, my biggest critique is the storagespace (hey Protonmail, storage should be non of your concerns, it got really cheap in the last 10 years)..and the prices are a bit high.