People don't have problems with other teams not sharing designs. Problems arise when people come out and bait others with statements like "xxx on our robot was so great, but haha, Im not going to tell you how it works!!!". If you want to keep your "proprietary" ideas secret, that's your team's decision. There's no need to be arrogant about it though.
And at any rate, if you want to see how 25's done their wheels, they have indeed shown everyone how to do it. See
this picture.