Why is this so complicated? This both counts the total number of other spells you control and checks whether you have a t least one other spell; but if you controlled no other spell the number of additional tokens created would be zero anyway.

That seems straightforward to me. I mean, I could omit Chain and rewrite the ability to also check the same way for additional tokens, but then I'd arguably have to omit chain from all the cards in the set. While such an action is doable, I would argue that Chain inhabits a space similar to Inspired in that it names something and ties that thing together for thematic purposes despite the ability being able to function without the name.