I think, you hit the problem. Nowadays very most people are using more than one device. IMAP Is a must.
Yet I assume IMAP was originally for those who travel. With so many countries in "lockdown", who travels ??
There are very few use cases for using POP. And if necessary, I wouldn't recommend to do so on a mobile device that will be replaced after 3-4 years.
I did see some sort of backup function on Aqua-mail; I assume that does a backup of settings and data, and can be restored on another device. I can see the use of IMAP in the mobile device replacement scenario (for myself), yet I have absolutely no need to have a copy of all emails sitting on an email server.
Anyway, if I want more than an inbox, drafts, trash and a sent box, it seems I am forced to use IMAP if we want extra folders. It would have helped if Mobi Systems had highlighted the fact that
extra folders aren't possible with POP3. To advertise POP3 and IMAP
without indiicating that POP3 doesn't have the ability to add extra folders, is frustrating.
I assume one can have IMAP and
NOT have the server emails as a mirror of what is on the Tablet. Any new emails on the server, simply download and delete from server. Any sent emails simply go to 'sent' folder on tablet.