Multiple Inboxes
The only feature that keep me on gmail vs. protonmail is the multiple inbox organization (not related to different addresses - underlying for a new post). The creation of multiple inboxes is extremely powerful to implement "Getting things done"-like methodology (ex.: https://dansilvestre.com/gtd-gmail/) and improve significantly my productivity.
I am looking forward for this feature in Protonmail.
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Kevin commented
I'm paying for an account with multiple domains and email addresses, I'd like to be able to set up two inboxes, one for business (with my business email addresses) and another for my personal. I don't need multiple accounts, I'd like all my email to live under the Proton Mail roof.