This.
I remember back when Gmail was new and hot. It was unlike any other email service out there, and ridiculing people for using inferior email-solutions could to a certain extent be justified.
While other webmails were slow, had constantly reloading pages and what not, Gmail was fast. It was amazingly fast. Gone where the 5 minutes making the webmail work for you. You just sent the email and you were done. Just like that. Back then, this was unheard of.
These days though? Everyone is still pretending like GMail is the only game in town, when I think they have one of the worst webmail-interfaces out there. And it's slow. Oh god it is slow. And god forbid you try to load it in a browser not Chrome, because then it just grinds to a complete halt.
So yeah. Happy Firefox-using FastMail-customer here. You couldn't get me back to GMail even if you paid me.