For the purposes of discussion, we will not get anywhere fruitful if we say "Oh, it can be anything you want it to" - again, I contend that a CTO at a 10-person

For the purposes of discussion, we will not get anywhere fruitful if we say "Oh, it can be anything you want it to" - again, I contend that a CTO at a 10-person startup is not an actual CTO but some kind of team lead / architect. It's a pointless name as it does not convey what it typically does and serves only to act as some status signal. Instead of saying "The definition of CTO is evolving" which is rather contradictory, a definition to make something distinct and clear, it would be better to frame it as that person's role is evolving, and that their title of CTO is not indicative of their actual role.