Originally Posted by
HTupolev
Today's Sora launched more than five years ago.
True. Todays Sora has features that are mostly reminiscent of 2010 Shimano 105 5700. Todays Tiagra has adopted features mostly one generation newer, similar to 105 5800. Trickle down is there, but it is a trickle. Latest and greatest is 105 R7000 and up.