If I could pinpoint the turning point as you describe it between "20 years of very little change and then 13 years during which the pace has increased dramatically" it would be the moment when SRAM introduced the new line of their X.0 group, which was exactly the same as previous year except it came in ̶t̶h̶r̶e̶e̶ five different ̶c̶o̶l̶o̶u̶r̶s̶ colourways - 2010
Or perhaps the gold xtr yumeya.
Nov. 15, 2018, 2:01 a.m. - ZigaK
If I could pinpoint the turning point as you describe it between "20 years of very little change and then 13 years during which the pace has increased dramatically" it would be the moment when SRAM introduced the new line of their X.0 group, which was exactly the same as previous year except it came in ̶t̶h̶r̶e̶e̶ five different ̶c̶o̶l̶o̶u̶r̶s̶ colourways - 2010 Or perhaps the gold xtr yumeya.