Discuss Tag:shop=camera here:
specialism of electronics
These days I think my answer to that would be "no". It's fine to just give camera shops a top-level tag under shop=*, given that they are a pretty common distinct type of shop, and we already have a lot of different shop types there, some with overlapping definitions. I was talking to myself about this over at Talk:Tag:shop=hifi (a similar shop type which is a specialism of electronics).