Running an email server for your personal email address is a completely different problem than running an email service. The IP reputation (RBL) problem is not a problem so long as you aren't running ...
Yeah — for a hobby box or a small circle, absolutely. My pushback is only against making it the default advice for a primary inbox people depend on daily. SMTP still works; the forever tax is receiver quirks, reputation babysitting, and deliverability folklore. Own the domain, outsource the mail-IP trench warfare.