В английской половине форума было длинное обсуждение:Он самый.
I registered here simply after doing a Google search on why I could not hide the lock screen notification on my Note 5 running 5.1.1.
Now after receiving a S7 Edge on 6.0.1, that notification is no more. So yes, it is a "problem" caused by the version of the OS.
I was running the Note 5 rooted but I could not find a stable enough method. My phone would randomly reboot at times and most of those times were during phone calls. I gave up the root and using Adaway and figured the minor annoyances posted in this thread were worth having a stable phone and being able to block ads in apps at the same time.