You don't pay $35M a year for 3 WAR pitchers, especially on a long-term deal for an aging pitcher losing arm strength.
Which is why the market changed the last two years, the analytics showed it was a bad idea, and someone like Arrieta found himself looking at 3 year deals.
It's risk/reward, if the salary merely pays market value for the best outcome, but the team is left holding the bag if the player falls short, teams will reduce risk by refusing to give long-term deals.
No collusion, just teams listening to their analytic guys.
Changing speeds is an art form (Colon is the master), something our young pitchers will need to learn, but Nola already understands, throws his 2 seamer at 91-93, but pumps up high FBs at 95-96 a few times a game. Different movement and speed on your FBs makes it harder to time it up as a game progresses. Mix them with a great changeup and you hardly need a breaking ball.