> I am the only person I know who uses a local email client, rather than gmail
Local email client is just a client for service. You know that you can use gmail with your local email client right? Gmail on the other hand is an ISP - exactly the same as in old days of using email client software. It is just like that today people prefer to use webmail over dedicated client. Well in fact they prefer to use their mobile email client (usually GMail) but still...
> The idea of email that isn't used as profiling material for one of the biggest
> advertising companies on the planet appears to be dead.
I doesn't. You can get email from like hundreds of other ISPs and it tends to work. Hell - you can even run your own email server!
> Along with it, as collateral damage, the idea of end-to-end encryption
WTF are you talking about? You can use GMail with end-to-end encryption. Just enable IMAP access and use whatever encryption scheme and whatever client you like...