Thing: I agree with you.
I speak as a military pilot, who did a bit of gliding in the past. Admittedly 15 hours or so, around 10 years ago.
When I fly aerobatics, I do so with a traffic service wherever possible. As to whether it's an annoyance, well id rather not crash into someone! Safety first.
I am happy to be educated, but I don't understand how a basic service can get in the way of flying a glider. Everyone on frequency (especially ATC) will know you're there. That's a good thing, surely?