I'm certainly aware of these issues, and wrestle with them regularly, as I still host email myself. That said, my professional stuff is also going through Outlook (my worst enemy as a self hoster, but I can't really switch right now).

Still, I see it as a positive that with enough resources/time, you can still get into this space, evidenced by all the smaller email providers which still pop up and seem to have pretty good deliverability. It's just still the best we've got. We won't widely agree on anything better anytime soon, even in more technical circles.