Kinda yeah, but not excessively so. Ibuki comes to mind as having more complex execution than most.
It's a matter of complexity more than it is difficulty though - most of the time. What I mean by that is the cancel windows and timing is MOSTLY the same across the board, there are exceptions of course but for the most part it's all the same, but some characters have longer sequences that require in-the-moment decision making as to how to end/proceed.
Using Ibuki as the example, you could land a jab, then decide to do her main TV then decide if you end in damage or Oki or spend resources to extend, then if you extend you decide if you want to double.kunai for extra damage, ex kunai for the launch then after the launch do.you want damage, Oki on KD or go for the air TC into a mixup or do you air kunai again for more pressure, and blah blah.
None of those decisions are harder to execute than the others it's just a matter sequences being longer and having more thought, as opposed to other characters who when you land a move you have a very straight forward and clear cut, obvious option.
