Please do not combine all email accounts in one inbox, I prefer separate inboxes for each email account and not all combined in one please

Honestly, mirror inbox features of the mail service that starts with a G. and the navigation of the mail app that's fruit flavored. That would make switching to your service far more seamless. If I'm searching for an email and I know which inbox it is in I should be able to search for that email in that inbox, and not have to sift through other emails. Especially if it's a manual search because I can't remember the search term. Even if I am entering a search term though, having to sift through hundreds of unrelated emails is really frustrating.

I couldn't agree more. Some of us use separate email addresses under a given domain for different types of mail/different sources. Having the the option of sorting added addresses (for a custom domain) on the side bar with their own respective Inbox, Sent, Drafts, Deleted, folders would solve so many issues. I'm glad Proton realizes that one user can have multiple email addresses, but this needs to translate to multiple INBOXES. Add this as a setting we can toggle if we don't want a unified inbox for all addresses please!

similar idea in https://protonmail.uservoice.com/forums/284483-proton-mail/suggestions/42505153-multiple-protonmail-addresses-to-be-view-separatel

I can't believe that I even have to explain this.

You know already know that the absence of this feature is severely hindering the efficiency and productivity of the user.

I'm a loyal paying customer and I've been with you guys from the beginning (well, almost)... please implement this.

You can use filters to move emails to folders. When I create a new email, i also create a folder with the same name as the email address for that email and a filter to move incoming emails to that folder.
Ok its not an inbox but it achieves the same thing.