The only real difference between playing the game non-season, and playing the game on-season, besides the paragon reset, is that seasons tend to have a few exclusive items. It's totally up to you if you'd like to play seasons or play normally. I've played all 3 seasons so far, and gotten to paragon 600+ in all of them, never really aiming for competitive play / leaderboards, though I did place in the top 300 in S1 for my class. But I won't be playing the next season. I'm going to just casually play my main(s). But that's because I'm burnt out and don't feel like restarting and leveling gems again. It's a personal reason -- you decide if you want to, or don't.
The only real difference between playing the game non-season, and playing the game on-season, besides the paragon reset, is that seasons tend to have a few exclusive items. It's totally up to you if you'd like to play seasons or play normally. I've played all 3 seasons so far, and gotten to paragon 600+ in all of them, never really aiming for competitive play / leaderboards, though I did place in the top 300 in S1 for my class. But I won't be playing the next season. I'm going to just casually play my main(s). But that's because I'm burnt out and don't feel like restarting and leveling gems again. It's a personal reason -- you decide if you want to, or don't.