The even funnier thing is, Gmail supports standard mail protocols, and can be interacted with using just about any mail client, and Twitter has a billion custom clients for it as well. The problem is that Google is hiding the SMTP/IMAP options deep behind needing a 2fa and "app passwords", and all the others are actively rejecting or working against letting people create custom apps for the services easily. There's no need for any of these companies to create any new software for any new OS, they choose to prevent people from doing so, and that's actively harmful in the current walled garden of an ecosystem we've created.