[zahlman]

What fraction of people do you suppose actually have a <yourdomain> to do this with?

Even some highly technically inclined people (like myself) can be entirely ignorant of the process. It's not as if consumer ISPs provide the service.

[roboror]

Sub-addressing (doing [e-mail]) is supported by many email services but + may be flagged as an illegal character.

[Terretta]

at least hotmail, gmail, apple's various mail, though with apple just using hide my email is that whole idea fully and beautifully automated for normies

[layer8]

The process isn’t difficult and worth acquainting yourself with.