Well, marginally. An easier and quicker shifting helps in shifting more. A more error-prone friction shifting might dissuade you from shifting and thus helps in ones cadence.
Oh, so it could help by default. I tend to 'shift' as little as possible in any case, so my cadence is normally good; I just want to be able to shift quickly and precisely when I need to.
Well, marginally. An easier and quicker shifting helps in shifting more. A more error-prone friction shifting might dissuade you from shifting and thus helps in ones cadence.