To add to what Crispy_tot said, Blizzard did mention there would be both battle pass rewards and seasonal challenge rewards (like in D3 if you played that).
I love how some people complain that the itemization & skills are so bad because of streamlining for the older now casual generations, but completely ignore how much Blizzard adds FOMO content like this to semi force you into the game, which is like the complete opposite of catering to casual players.
It sucks, but it’s also not just blizzard. So many games are trying to keep you playing 24/7.
And say what you will about halo infinite/343 but at least you can complete the battle pass even after the season. It’s not perfect but it’d be nice if that was adopted by more games.