I don't think it's anyones business what client I used to create notes. If I want to advertise your client I should be able to turn it on. On by default is a big no from me, sorry. Anything my client appends to my notes without my permission is too much imo. Tags are generally not user-facing. 

To be clear, I have been very against this for a really long time, but I'm a nostr nobody. I've had it on the roadmap for my signer since the spec introduced it.

https://github.com/VnUgE/NVault?tab=readme-ov-file#extension