In some hamlets buildings are spread out with fields, etc in between. Because you can't really define a boundary I use a node only for these, but for fairly welldefined villages like Fjellerup I think it's usually better to tag the polygon.

Also note the sentence "although the area has clearly advantages even if only approximative. " in the text you linked to.

I dont' see that as a good reason to have place=* etc on a node only. Mind you that I've been working to transfer lots village names etc to polygons. If the place=* covers more than just a residential area the better choice would be to create a polygon which encompasses the other areas too rather than just create a node.

Why did you remove the place=village from the polygon?

In Denmark we are following our official classifications, which doesn't necessarily follow systems found elsewhere. If you look around Denmark you'll find lots of relatively short stretches of road classified as trunk. Maxspeed on these are usually 90 km/h and you're not allowed to walk or drive slow vehicles.

Bemærk at restrictions med mere eller mindre end 3 medlemmer (1 "from", 1 "via" punkt, 1 "to") ikke lader til at være gyldige.
I mange tilfælde kan det være bedre at anbringe et lille stykke oneway i stedet.

You can do this by making sure that iD is opened in Denmark

When editing in Denmark, please be sure to use our national imagery over Bing etc.

Why did you change this? As far as I can see it's actually signed as a trunk road: https://www.mapillary.com/app/?focus=photo&pKey=WXdrBj6QCh-ujzsD0RXE7g&lat=56.15747528&lng=10.07113802&z=17 . Also note the source:maxspeed on way/130294812

Imerco is more like a shop=houseware

check_date=* might be better

Bemærk at her er tale om en Maps.me bruger uden forudgående erfaring med redigering i OSM. Ofte har disse ingen ide om at de lige har lavet tilføjelser til OSM, så her er det generelt bedst bare at slette evt dubletter eller andre fejl

I feel adding source=Kaart* to way/87905545 or node/4408160855 is taking a bit too much credit for work you didn't do. All you did was add a addr:street tag

Du fik rodet 2 adresser sammen her

They are quite popular in Denmark. That's why I know :-)

Røde Kors shops etc are best tagged shop=charity

Jeg tror vi skal lade det være som det er nu :-). Der er ikke foregået decideret vandalisme, men vi retter jo allesammen på hinandens ting og vedkommende har måske ikke helt forstået situationen. Han redigerer normalt ovre omkring Fredericia.

Ved hjælp af Achavi kan det lidt bedre ses hvad der er sket: https://overpass-api.de/achavi/?changeset=49217702

De skyldes en femte person der har åbenbart har set diskussionen her og har forsøgt at "forbedre" :-). Se way/161286048/history.
Bemærk iøvrigt at alle veje har en historik og at vi foretrækker at eksisterende veje modificeres fremfor at at man sletter og gentegner dem. Bemærk også at det er muligt at rulle ændringer tilbage.

There are several reasons I guess. Not all mappers are very accurate (not even in Denmark) and some obviously just wanted to get buildings on the map very quickly. Also our first national imagery (Fugro), while being immensely helpful at the time, wasn't very well aligned everywhere and was of such quality that the shapes of buildings were often very hard to make out. In some areas buildings were imported from national databases (in i.e. Kolding) and while these are extremely well aligned, for some reason they are almost all lumped together in big blocks. Personally my primary focus was always on the road network (I'm responsible for aligning like 80% of danish roads to recent imagery/gps tracks/strava) and for me buildings/3D were always of secondary importance, so while I like to be fairly accurate I never cared too much about buildings myself and usually lump a few together too, because it's just plain quicker. If you care a lot about 3D etc you are welcome to split them though.