Too many artist entries for the same person?

Can someone verify for me here? Is there currently a policy about this?
I’ve recently had artists I created merged – and I feel chastised as a result. Apparently someone thinks it was wrong of me to create separate artist entries for the two different performance names of the artist.

(relatedly – I get “edits for your subscriptions” messages just about one a day — and there’s on average a half-dozen edits listed in each message – I don’t always spot the ones that I should care about – so I didn’t notice the merge request until it had already passed )