Rogue will take a step back when level five is in the game. Thief double bonus action will still be strong, but when all the melee classes get double attack EXCEPT for rogue sneak attack will struggle to keep up.
Lae'zal plus weapon master will crush Astarion dpr wise (although you can always bring both).
When (if) multiclass is in the game just get another 5 levels of fighter or ranger and Thief will be the king of DPR with 4 attack per round + sneak attack. Ranger can add hunter's mark to that and Battlemaster adding potentially another sneak attack through Riposte.
All of this however still doesn't make any sense beause Thief in 5e is not supposed to be focused on dpr.
