Standardisation, some hope, I need to change the BB on my newest bike (2020) for which I now need yet another bottom bracket tool, this will now sit in the toolbox with the other 4 different ones. Through axles, bought an adapter for my Thule roof carrier, the new bike needs a different size as the boost axle is longer.
Components are not as good quality as they were, my 18 year old Trek still has the original XT mech, shifters, brakes, which work fine after 18 winters, yes it’s had loads of jockey wheels, the bb is a screw in cartridge type and done at least 10 muddy winters.
Got to admit very disappointed with my newest bike (£1275 hard tail) to the point of parting with it and using the old original instead.