Quantum mechanics only says that you can't predict the spin of certain particles. Those particles are at a vastly different scale of the things we see in everyday life. Yes, a photon might suddenly change direction and I won't see it because it's a wave function, right? But only at a really small odd. I bet it has never happened to me or anyone in my continent, if not the entire human race in all time. Let alone neurones in my brains experiencing quantum effects.
Quantum mechanics dismisses no argument of determinism because how low the possibilities are.
Even if macroscopic particles do behave randomly, it is still a random behaviour, not your decision.
I don't think this uptick of 2.6 sounds fair to be interpreted as a timeline because it stuck around for five years. Also around that time embedded devices boomed, and LTS kept it alive well into 2010s. I bet there have to be a large amount of swears from the later developers tried hard to fix bugs.