The instances in the code where the sheath is required to remain intact through a raceway are where the sheath is not properly terminated with a cable connector... only secured close to where it enters the raceway.
Also, many construe 300.3(A) regarding single conductors to mean only listed and marked types of conductors are permitted in raceway... but that is not what it says. It says the single conductor types listed in Table 310.4(A)
must be installed in raceway. It does not preclude any conductor from being run in raceway.
Granted, approval is up to the AHJ. But if you have an AHJ that doesn't approve such an installation, I would seriously question how they discern between safe and unsafe conditions. You have a recognized Chapter 3 wiring method of PVC sheathed conductors... yet they won't approve the same conductors in a raceway which provides conductor protection superior to the sheath... ???
And then there is what Bob (iwire) said...