Well, that's also part of the problem with Rogues. They have great skills. What those skills do is almost entirely undefined. And every GM is going to have a different idea of what they should be able to do, particularly at higher levels. So you're a19th level Rogue, everything you can do with your Thieves' Tools is at maximum, and... What? Can you unlock the side-door to the Hells and sneak in? Ask your GM, plenty of whom will default to being cautious about what exactly they allow those skills to do.Currently the rogue has more utility than any warrior, even arguably the ranger. Expertise, 4 skills + thieves tools (which in the current rules means that taking slieght of hand give the rogue advantage on every check to pick a lock or disarm a trap) cunning action, level 5 cunning strike makes cunning action more versatile, level 6 expertise, and level 7 reliable talent, is a crazy package.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.