Since the magic of FM is in the modulation I would tend to say that you are not wasting something but potentially missing something, if you don’t use all the facitlities of the DN.
As in many other Elektron devices the synth or sound engines provide a huge number of different parameters, which can be changed and modulated at any time. We can do this from any decent DAW, of course, but this requires to set-up many CC lanes to have access to the parameters we want to use.
For complex modulations I prefer to use the p-locks on the Elektron instruments. It’s quick to operate, and immediate control of the sound, feel, and groove. At the end of the day the sound will be recorded in the DAW anyway …
It’s only about personal preference and the workflow we want to apply …