I disagree with that <smile>. I think of the subject as the name of the thread, and as the target of a search. So I would want the subject tag included in every reply. Of course clients don't need to render the subject in every reply.
From: pablof7z<-DerekRoss at 06/10/23 08:34:41 on wss://atlas.nostr.land
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>yeah, I don't think the subject should be tagged on each reply, just the OP, replies shouldn't copy the subject tag imo
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Why include the body of what you’re responding in emails’ broken format of > quotes? A tagged event already provides the quoted text in a far superior/structured way
This looks broken 

You can’t search by subject (not 1 character), and you can find the tagged events for the threads snuck more easily and bulletproof via #e queries