Hiya, Marlene --
It's a 'choice' because I love doing it and start out with the intent to make more than one related thing; to purposely carry the idea out to series-level.
Sure, a series or collection can grow organically, but -
Deliberate intent + considered application = Choice
There's absolutely nothing inauthentic about personal choice. Not in this case, anyway. (See the current Kardashian thread.)