1.9m is 6' 3", already in the 93rd percentile of US adult males according to this chart. https://preview.redd.it/oruqlgczepp91.png?auto=webp&s=cb797f... 2.1m is in the 99th percentile. Maybe you just have a lot of very tall friends.
I think once you get past the 95th percentile in any metric like that things start to get more difficult. I'm not even that tall and I sometimes have trouble finding pants that fit me. I imagine there are probably similar difficulties on the other end of the spectrum being below the 5th percentile.
Maybe. I used to like being tall, but seeing a colleague use a fixed height desk as a standing desk has made me reconsider.
Short people would seem likely to be comfortable in more places.