Because you dont control nostrplebs, or nostrpIebs. Or nostrverified or primal or alby etc.

If an imposter comes along and registers their pubkey with username on different domains, how are people to know which is the real account? 

This is of course most practical if one already has a web presence, and essential if one is an influencer of sorts that would be a target of impersonators.

 

 But do people know what a nip-05
Is? We are still so highly technical and this isn’t practical for the majority we hope to onboard someday. 

And for me, tbh, I’d need hours to figure this out. 

I get that I don’t own or control it, but paying for a service that saves me time works for me. 

 Your website appears to be using ghost. I dont use it, but I know thats a fairly popular platform. The following might be applicable

https://orange.surf/nip05-with-ghost/ 

 I’ll have to check it out in the spirit of testing…when I get some time 

 Yeah, big fan of Ghost. Wish they’d stop with their activity pub project though