Hello,
1) on several paths I applied the "simplify path" tool of josm, I think with either 0.5m or 1m parameter. Is that not good practice? They seemed like GPS imports. Sometimes I adjust them by hand based on strava or based on my own GPS recordings. In nature, when you have a lot of strava marks somewhere with no way asssociated to them and nearby  you have a way with no strava marks on it, I usually conclude the way is misplaced (which is usually supported by my own gps recordings), but I correct these things also when I see them nearby to places I walked through. In my understanding, when you originally have a way that originated as a GPS record of a single hiker, it will be imprecise at times.

Which concrete ways do you have in mind?

El Arco <--> Lago Vidal is not from me, that was already there. I was mainly adjusting the sac_scale and trail visibility so that it better fits the wiki standards (but these are sujective, anyway especially around Cochamo the difficulties were by far too hard, indicating using your hands when that is not the case) but I was mostly not changing the names. The only exception that I recall is the Laguna trail in Cochamo - this name was used on a guidepost there.

I know about fords. For some reason iD complains about that but JOSM does not. I tend to add those when it is an actual ford where you need to wade into the water (which depends on season anyway), but when it is a jumping or stepping over thing, I personally think they are a bit superfluous (in ideal world width=1 or something like that would apply to the stream). I do correct JOSM complaining about water and highway not sharing a node.

(where I changed bridge to ford or the opposite, that is because that is what is there in place, or at least was six months ago)

I will check out the plugin and ask you about it if I struggle with it. Might be a nice things, I use only a subset of what JOSM has to offer.

No offense taken, I think it is good you look over the changes.

There is one thing I am worried about this edit myself - JOSM was complaining about the same geometries overlapping each other (mainly wood). I tried to fix that, but I think I changed the way these large landuse polygons are made. They tend to use method A as described here: https://wiki.openstreetmap.org/wiki/Relation:multipolygon#Mapping_style,_best_practice
and I was switching them to method B before I realized that was not the best idea.