Hello.
Thanks for your editions, I corrected some of the buildings you drew yesterday due to some misunderstandings in the way we approached the building in OSM.

We draw the base of each structure. We do not group structures into schematic polygons over each building. 

A lot of the ones you draw are just approximated polygons over where a building is located, but it is clear in the picture that there are several buildings that can be drawn separately and with more detail.

Besides, some of them can be seen over roads and some of them touch each other in single nodes, which is clearly not true.

We appreciate your time and your willingness to help and our intention here is to help, but a more detailed effort is needed here. Sadly, there are a lot of examples of this not made by you which probably led you into thinking that this is the way.

in Chile, you can go to San Fernando, which is a very detailed city. Or every single city in Europe is good enough to provide you with a visual example of what I am talking about.

Tip: you can “square” a building using the Q key. The ones you are drawing are clearly hand-made.

regards