An edit to Thieves Cant

[Witty Username]

Bring Slippery mind down to 7 or 9, and add a 1/Long use of Stroke of Luck at 15. Blindsense could be brought down to 5, and just add another ASI there. Mix that with some of the sneak debuffers from 5.5 and Rogue gets a solid buff while still keeping the same mechanical feel.

I don't much care for blindsense because it doesn't seem to work RAW.

Slippery mind being brought forward makes sense. Use the One D&D version that covers Charisma saves and put it at 7th, 5-7 are pretty thin for rogue on the quick look, so it is a good spot for placing.