Hallo Pan,
Thanks for your reply. I don’t really understand the reply but maybe I am just missing something. If a whole area (in this case a forest and a meadow) is made out of one line or many lines does not change the position of the nodes which form the boundary of them. (and determines the quality) You and the other OSM users are of course free to add/move/change nodes over any length they can and want to improve. (1meter 10 meter 100 meter is of course not up to me to determine)  A little to the side there is a fence and a strip of grass/scrub between the meadow and the forest. That is now half on one line half on the other. Stuff like that. The line than needs to become forest/grass or meadow/grass. Its all a bit of a hassle in my opinion.  Furthermore I don’t understand why it is for example important that you took satellite imagery as a source for the first 100 meters and somebody else took on the ground knowledge or gps or whatever for the next 100 meters. Why should that cause a split? Why does different source/ quality matter?
I for example have never splitted a road at the end of what I changed just because I only know 1 km of a 10 km road. It just creates more work. (even if I think that my 1 km is good and the other 9 km needs a lot of improvement)

In short leaving everything as one line does not change the quality of nodes you added but enables easy mapping and a clear and clean view of everything. I still don’t see the benefit of splitting ( I do not have a question about the place and or quality of the nodes themselves)

I will see what I will do near Gsteig. Maybe I can find some info about this method online. 
If you could elaborate a little than that would be great.

Thanks

Beau 
