The practical experience of having your own domain for your email is that you delegate your domain to Google / Fastmail / Proton / whatever, and it takes care of everything else. Some webmail providers will also let you buy a domain on their own website as a part of registration flow.
It really is not hard. Harder than not having a domain of your own, but not as hard as you make it sound.
Records, shmekords.
The practical experience of having your own domain for your email is that you delegate your domain to Google / Fastmail / Proton / whatever, and it takes care of everything else. Some webmail providers will also let you buy a domain on their own website as a part of registration flow.
It really is not hard. Harder than not having a domain of your own, but not as hard as you make it sound.