It is an interesting argument. Although they may tax the arm more, what exactly does that mean in terms of long-term muscle damage, and is overuse worse? It's a question that only a Dr(aven) could answer
Evidence suggests over 130 is bad. Regardless of how we argue about different pitchers have different limits, it basically is just a refinement of acceptance of 'pitch count' strategy - that a certain amount of work will break a starters arm.
I've no doubt throwing 130 curveballs would hurt more than 130 fastballs, but it would it necessarily be worse long-term? Short-term pain could actually be a limiting factor on long-term damage by making a starter ineffective quicker. IMO, overuse is the primary problem, while the rest is variations (but important variations) on a theme.