As a Fastmail user, every time I have to use Gmail for work I'm aggravated by the absolute stupid UX of it which seems to have been thoroughly ruined around the Material Design era; it also seems to be unable to handle basic operations such as mass mark read or delete, or search.

Fastmail handles the same things with aplomb and has much better screen real estate usage, for one.

The only thing I kind of want with Fastmail is if it had some EU-based datacenter.