Moving Apps to micro SD card

[blegs38552]

I just finished moving apps from the phone to the SD Card (Storage Sense + phone + games + apps, select all and click on Move).

I was left with several apps totaling some 236 MB (not complaining, as some 2 GB were moved), but am wondering why these remained on the phone. They are:
Music
Video
Games
OneDrive
Calendar
Podcasts
Battery Saver

Does anyone know why these cannot be moved? Do they represent some kind of system app that has to be in the main phone memory?

Good news - I now have 420GB free, and all future apps, music, photos...etc. will be written to the SD card.