I agree with the majority of contributors to this thread and see it as encouraging that it is supported by the wider community. I have flown in regional competitions and now have about 1500hrs (gliding) so do understand all the issues highlighted, but definitely do not agree that glider pilots are under so much pressure that the radio is dangerously distracting.
Although well written, I do think the letter has some comments where the tone is misleading. There is a small subsection of glider pilots who do not have any intention of conforming or doing anything they are not required to do and thus are the ones least likely to obtain an rt licence.
They are also those GA who make no allowance for gliders and do not take time to understand why a glider may be close to cloudbase on their planned track.
On the whole a reasonable letter but I still think there are some personal views that could have been toned down.