I really like email. Something about its free as in freedom nature/protocol fills me up with joy as I fire up my email clients! It’s just nice and warm compared to all the corpo bullshit messengers. Sadly, Google and Microsoft are trying their best to lock down email. But I believe it’s gonna outlast their shenanigans, hopefully. Meanwhile, I have my trusty local email clients to keep me company
Very solid reasons mentioned by @nobody158@sh.itjust.works in the sibling comment.
Another issue is that they forced people towards top posting which combined with the rise of html email led to the decline of plain text email, which really sucks for not just privacy but also accessibility