Yes veteran monsters cap at 50, except the ones that get a +2 levels above the players, boost.
No spoilers ahead, but if you care about the aspect that it might be immersion breaking after beating the campaign, donāt worry, everything still makes sense even doing the side quests after the campaign. Evil has endured since Diablo 1 and before. Sanctuary will never be at peace and people always need help 
unless we use the tree of whispers and soul stones to imprison the prime/lessar evils in its heads, for eternity. then the Eternal Conflict may actually end.
I been wondering his too. Iām only in Act 3 (I think) and Iām level 50 + 3 paragon levels.
Iāve been doing every single side quest.
Glad Iām not the only one! I just finished Act 2 (I Guess) at 50+3 paragon levels.
Never thought of this - I guess Iāll end up doing the same.
Itās certainly counter-intuitive. I feel like side quests are mostly for getting renown 4/5 in each zone and although theyāre all doable as you come across them the extra renown rewards are also locked behind T3.
IMO the only barrier for T3 should be being lvl 50. That way people who decide to focus on side content arenāt stuck doing underleveled story content. They would also get their extra renown rewards as bonus power to blast the campaign with.
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Once you hit 50 (or 49) I would recommend skipping side missions and doing the campaign.
Thatās essentially what I did, and the benefit there is that I had a lot of those side quests to do (especially in Kejistan and Hawezar) when I started doing Nightmare content.
Also, you can only unlock renown 4 and 5 in Nightmare mode, so, might as well hold off until youāre done with the campaign and can jump right into that content after youāve done the capstone dungeon to unlock it.
yes theyāll be max level 50 even if youāre past that.
Completing the campaign unlocks the first capstone dungeon, which you are required to complete to unlock T3.
Only your first character needs to complete the campaign. Afterwards, you just need to do the capstone dungeon, which is tuned for level 50. You can clear it at a much lower level with help.
You unlock them when you unlock WT3. You can clear them in any world tier.
Farming renown in WT1 is most efficient.
I saw some reddit posts of people being locked behind walls from some side quests after the campaign so I feel like Iām forced to do them :S
Bro if thatās the case then an ARPG is absolutely not the game for you.
The campaign is like 5% of the game.