After months of dealing with things like the emails in my Inbox getting deleted, not being able to read new emails and refreshes taking 6-10 hours, I figured out a solution. I use Outlook for work and decided to add a new account pointing to Xfinity MMAP and SMTP servers (easy to do) and now I can read emails in realtime!
Yeah, other clients seem to work well. Using a browser this interface is still a little clunky, but never had the issues seen with the IOS app.
Mozella's Thunderbird works well, too, and it's free.