Not allowing IMAP/POP isn’t just for the lulz, it’s not compatible with the encryption architecture Proton uses, which is kind of the selling point of the product. You can either have your emails encrypted at rest with your key OR you can have plain IMAP/POP without a bridge client, you can’t have both.
Did I anywhere say it was for the "lulz"?
I never really understood the point of that. If you are exchanging emails with someone using one of the most popular email services that together make 99% of the marketshare, their server retains your email unencrypted anyway. So the only time that encryption will really matter is when emailing someone who is also using Proton.