There does appear to be cumbersome methods: (that you may not know of ..)
(1.) Goto: Settings > Applications Manager
For each application, un-tick 'Show notifications', press 'Ok'.
( repeat 100 times )
(2.) Goto: Settings > Applications Manager > (scroll to right) (select ALL)
For each SYSTEM application (you don't want, eg. Google+):
- un-tick 'Show notifications', press 'Ok'
- click 'Force Stop', wait .., click 'Ok'
- click 'Remove Updates', wait .., click 'Ok'
- click 'Disable', wait .., click 'Ok' (option not visible, until updates removed)
( repeat as needed, for: Chat On, Group Play, Hang Outs (Talk), You Tube, Game Hub, WiFi Direct + WiFi Direct Share )
My real question ..
Is there a tool to automate this? (global disable-notifications, simple un-tick for system 'bloatware')
Why is this not in Google Play (from desktop browser)? More of a philosophical question.
What portion of (unwanted) data traffic is caused by this 'bloatware'?