It is ultimately technology and legislation driven rather than 'fashion'. If a new pigment comes out that enables pure white or black or silver or any other co

It is ultimately technology and legislation driven rather than 'fashion'. If a new pigment comes out that enables pure white or black or silver or any other colour at a cheaper, better price then that sets the fashion. If that new pigment later turns out to be a fire hazard or toxic on some way then it goes, for some other colours to be used and therefore 'the new fashion'. If you look at aluminium finishes, the smooth, polished look fell out of favour just around the time that a variant on the shotblasting process became cheaper. So aluminium became less shiny. There are many other factors but a surprising amount of what dictates fashion is a new industrial process or chemical discovery.