This makes it something that the average person cannot do; you're suggesting something that already requires more time and resources than 75% of the population has access to.
If you're serious about this than go talk to a non-tech person and tell them to self-host email and see how they do. Look at their challenges, build a solution and then offer it.
Please don't try changing the goal posts by introducing "non-tech" people into this.
That's not at all what the conversation is about, and routing through an external place removes a whole bunch of hassle compared to setting up and maintaining outbound email.
You might not like it for some reason, but that's on you.
If you're serious about this than go talk to a non-tech person and tell them to self-host email and see how they do. Look at their challenges, build a solution and then offer it.