Season 10 of Diablo III took place at the same time that the Necromancer beta did. I ended up deciding to split my time between the two of them, rather than put all of my video game playing time into one (and missing out on the other). Despite this, I ended up making about as much progress as I hoped to in Season 10.
If the Necromancer beta had happened before Season 10 started, or after it was over, I might have gotten farther in Season 10. Overall, I’m happy with where I ended up by the end of it. Season 10 started off with several new changes that, in my opinion, improved the game.