AFAIK you can not uninstall One Note ,Edge or Cortanna (now) ,or the Windows Store link WUP apps you can just keep them semi inactive and un pin some of them from the start menu that's about it while most other windows store WUP apps can be uninstalled including the mail client but you have to use windows power shell to uninstall the mail client *all the way .
That being said the Groove Music player (what WMP should have been from the get ) and the Mail client ,Photos ,Calendar, Calc , and MS Money, MS Sports ,Photos and MS News live tile apps from the Windows store free (which you can turn off the live tile feature in ) and Connect are real are decent as WUP apps go.
I use them and if they bog down your PC you needed a new one or a better one and some bandwidth for the live tiles in 2012 anyway and you can otherwise populate the rest of the start menu window with shortcuts like I did ☺
Microsoft Windows 10 fast ring Insider OS build 1607-14901.rs1 pre release