Labels are a brilliant idea to organize mails very efficiently.
I use labels and benefit from the possibility to use them via an IMAP client (in my case Thunderbird) as virtual folders.

My ask for improvement is:
When I am deleting an email in this virtual folder I expect that only the label got removed from this mail, but in contrast to my expectation the labels-over-IMAP implementation of Proton is deleting this mail than completely.