Hello.
(I'm sure that it's been said before, probably on this thread as well.)
It is what it is. Get over it.
Either stop griping and move to another provider, or bite the bullet and stay with Fastmail.
As a former (and present) Fastmail critic, I have sought and tried alternatives (especially during the Opera debacle), but never found any alternative that had the features FM offers for the money.
I've tried Rackspace, GSuite, Office365, ZoHo, 1&1, euMX (paid), Polaris, HMail, Runbox, and many others.
I still have two Runbox accounts that I would use exclusively, if and when, RB is ready for prime time. Not too hopeful that it ever will be.
By the way, I used to run my own SMTP servers, but no longer bother. Now, I rely on FM and, when sending to problematic GMail addresses, my grandfathered GSuite account.
Good luck to all.