@nta @elejia @mcc No idea why Pro N is missing those – the Store works.
Media Feature Pack is kept over feature upgrades as long as you're upgrading from a version where MFP is installed from Optional Features (though I've had MFP missing after upgrading 10 to 11 a few times, although in those cases manual install also failed and I had to run DISM.exe /Online /Cleanup-image /Restorehealth first).
One problem with Pro N is that even if you install Media Feature Pack, a few things still don't work (eg. Augmented Reality).
I recently came upon a tablet with Windows Pro Education license, which seems to be the same as Pro, except there's no auto-installing crap like in Pro N (but media support is present). Still need to test if Pro Edu will activate without a key if Pro was activated on the same machine.