I suspect if you shared more info about your mail infrastructure, it might reveal that what is working for you is too complicated for 99.9% of people to set up and maintain themselves.
I don't think the goal is that every non technical person can host their own mail infra.
But most people who can run a server should be able to setup OpenSMTPd with the DKIM filter and Dovecot. It's much easier than configuring postfix like we had to do in the past.
To answer a sibling comment, the last time I received an answer is a few minutes ago. The correspondent's email infra is hosted by Google.
You're right, it used to be a bit complicated. Now you just need to have a reputable and clean IP address, and knowledge of running some services in docker and of course understanding DNS and its crucial role for running a mail server.
I used to run all the components and maintain it (even that wasn't bad), but I changed to mailu[1] about a year ago
But most people who can run a server should be able to setup OpenSMTPd with the DKIM filter and Dovecot. It's much easier than configuring postfix like we had to do in the past.
To answer a sibling comment, the last time I received an answer is a few minutes ago. The correspondent's email infra is hosted by Google.