For mtn biking-too dangerous--wouldn't want a stand to come down when hitting a root, rock, whatever!
Road bikes-don't know-but it's the one part which doesn't seem to have ever been subjected to new technology-they are the same today as I remember them from over 40 yrs. ago. Would seem someone would have come up with a "stealthy carbon fibre, disappear into the frame" type stand somewhere along the line.