Kristian:
I think that you are correct about the world records - but more pilots (who cannot afford to go to Namibia or Argentina) are interested in national records for their country - and in those countries the difference between 18m and 27m is important.

And on your last point, "I would actually like to acknowledge records made with pure glider. Now there is a difference" I agree completely. With a motor available, it is a different sport.

Best regards
ROY