Exercises on lichess are one of my favorite ways to kill time. Haven’t played a real game in years but I love the low pressure of running through little scenarios, even if I can’t always grasp why the computer thinks a particular line is optimal lol
(And you can do a bunch of them offline)
I don’t remember anyone saying 10 was worse than 8. Maybe buggier on launch, but stylistically it worked more like 7 than 8 did