I have not used this in Kodi for at least three years when internet connections were worse and streaming sources too, in CoreELEC I have never used it and I think it is not necessary. If the streaming source is bad then there is no advancedsettings setting to fix it.
kodi.wiki says this: "The advancedsettings.xml file, which does not exist by default, can be created by a user in their userdata folder. This file is used for advanced settings and options that do not have GUI controls inside of Kodi … . "
There is no need for the advancedsettings.xml. The N2 is fast enough. If you have problems with stutter you need a faster storage or internet connection
By the way… " CoreELEC is the hammer!" … you are german, right?