That's exactly my point. Yes, by 2015 105 had moved on well, and truly, but that is missing the issue at hand.
Comparing 4700 (good guess!) With 5600 (another good guess my friend!!!) shows the trickle down effect which Shimano trumpet so much, how a more humble geartrain today shares many tech features with the higher one from few years back.
With no mechanical 105 geartrain, where will that technology now come from? In the past Shimano would invest in R&D on the Dura-Ace and Ultegra and over the years that would trickle down to the more humble offerings.
Will Shimano continue to invest at such levels in R&D for Tiagra, which they, the media and the market (us wise people know better
) regard as a fairly low rent system for dressing lower rent bikes? I betcha they don't.
I do feel aggrieved that as someone uninterested in electronic shifting In been abandoned by Shimano. I'm not alone, and they've essentially walked away from a fair chunk of their market. They were doubtless hoping wealthy middle aged gits like me would spend out lolly on e shifting, but I and many like me won't spend money on something that personally brings me (us) no benefit beyond the bragging rights that don't interest us anyway.