Earlier quoted context omitted.
I think it's pretty reasonable. The percentage of email accounts Google & Microsoft terminate seems far far lower than the chance I misconfigure my email or lose my domain
I'd rather trust myself. If you walk around all day with your wallet in your pocket, it might fall out and you'll lose it. Would you like me to hold onto it for you to make sure that doesn't happen?
On the other hand, it's email. I was at a hospital to do a blood draw, and needed them to receive an email (insurance info). I sent them an email from my Gmail. We wait 4-5 minutes. I notice they're checking an office 365 outlook. So, I re-send the same message from my @outlook.com email. Arrives instantly.
Deliverability between MS and GOOG is normally really good, and even that wasn't working right that day. My self-hosted email server being able to deliver to them reliably every time is hopeless. "Big Email" has made it excruciatingly painful to not be on sending from one of their platforms, unless you're one of the big 5 or whatever platforms that send bulk email or bulk transactional email. The SendGrids, Amazon SES, etc.