Vincent de Phily
https://wiki.openstreetmap.org/wiki/Maxheight

How many more notes will you dismis as irrelevant ? Have a look at https://wiki.openstreetmap.org/wiki/Map_Features and the actual map data to see what kind of things we map.

For example maxheight may not be displayed on a rendered map, but it's very important for routing. Many things people find useful to map, even if they're not displayed on most maps. Being less limited to a particular topic than other maps is one of OSM's great advantages.

Also, you should register an OSM account and reply to notes while logged in : this'll allow you to receive note replies by email.