Yes, Thief is incredibly powerful. So much so that I think it might be even better than Assassin for the Rogue/Gloom Stalker build, because more bonus actions means you can always have Hunter's Mark on. I also got a lot of mileage out of Misty Step on my Rogue/Ranger, which would be great to not have to compete with Hunter's Mark or off-hand attacks for in the bonus action slot.
I don't think I've seen many Acrobatics checks. Most common in conversations is probably Persuasion/Deception/Intimidation, then Insight, followed by the other knowledge skills (Arcana/History/Religion). Survival and Perception come up in the field. Sleight of Hand is mandatory for disarming traps and locks.
