Worst updates since 1.8.8

Me too, I used to mod for 1.8 for a while but stopped a few years ago; The combat update literally split the playerbase in two which is why (in my opinion) it was the worst update. 3-4 years later Mojang still hasn't brought half their playerbase onto their newer versions. All they'd need to do was add an option where post 1.9 combat was available, and there would no longer be a requirement to support versions which are nearly half a decade old.