Really, anxiety? Use a native/local mail client and I'm sure it will solve your problems.
Thanks, just found the HN thread about email clients. Checking out Airmail now.
It drives me absolutely insane when a company makes an 'enhancement' and reduces usable window space. If I am writing a long email I want to be able to use the maximum amount of window space and not be crammed into something that is 25% of my monitor size.