...I have a theory on that
But it's probably not liked..

...
'KA' has changed ....the whole KA affiliation thing just makes people blase'...
...waaay too blase. .(..blasee../..blasiert)
They then just assume that because they are a part of 'KA' its the only thing that matters .
They assume everone instantly knows their lines are clear and don't have to even bother waiting for a thumbs up
Or wingers is another theory....who are bored of kiting &just see kiters as messy people with seaweed in their lines...
Try launching down the bottom of some cliffs and jumping off rocks to get out U KA groupies(not all)... bet U can't aNd hang your tether off a cliff in the wild ...

Vdws have great thumbs
I can safely say that every German thumb I have come across is my favourite ....
...Except for one ...