It should be optional.
Discussion
It is!
It would be nice to have an ability to change email address, I hope this can be worked into a future version of nostr:npub1hcwcj72tlyk7thtyc8nq763vwrq5p2avnyeyrrlwxrzuvdl7j3usj4h9rq
Email support, they can help you out.
But not optional if you want a custom address correct? KYC if you want to buy btc via WoS?
Enjoy not having email attached.