Mumford put it better than I ever could, although not all his concepts and phraseology are known to the average reader.
I disagree with the notion that electronic gearing is more complicated. I view it as a simplification....
perhaps you have never looked inside one...? ...
(I know you meant as a user interface BTW, but even that isn't true- where would you be without a computer/phone to program it...?). You will note that I didn't hold up current mechanical shifting as an exemplar of 'simplicity'; I know folks who carry a friction lever as a backup when touring, rather than be left in the poop if/when the STIs clap out or are damaged.
.....Thing is, how is that different from non electric? If a tiagra 4600 series part fails, it's going to become increasingly hard to find replacement parts, tiagra 4700 is incompatible with 4600... the same is true a cross groups etc and brands at all points in the price range. I have a Calton touring bike in my stable that is older than me It needs a new rear hub. It's hard to find one that is compatible these days..it's a 126mm oln hub with 5 speed block. Bikes change, tech changes. I admit it's bloody infuriating that there's a lot of incompatibility within bike components. But that's not made any worse by electronic shifting.
When your 4600 components clap out there are lots of others that would be good substitutes. For example the RD shift ratio is one that is shared with (literally) hundreds of different models (from more than one manufacturer) starting as far back as the 1970s. If the shifters bork themselves there is a similar argument to be made and of course you can always revert to a friction shifting if you want to, because the system is, in essence,
simple. You could go into almost any bike shop in the world with broken 4600 stuff and come out with a working bike again, having changed a minimum number of parts.
This is
profoundly different from electronic systems; if these parts are not (very deliberately) designed to be compatible with one another, they aren't, simple as that. No compatibility between manufacturers and incomplete compatibility within = built in obsolescence at best.
But it is worse than that; currently many framesets are built to accept a variety of components, courtesy of various 'open standards' in the industry. This means that you could buy a modern frameset and (say) equip it with a 60 year-old groupset, and it would work. This is appears to be a fanciful notion but the underlying point is that your bike will always be easy to repair as long as it adheres to this approach. If you start redesigning everything (and Di2 etc is just one example of this) you end up with a bike that cannot be repaired so easily or indeed at all.
This has already become so bad that (if you were so inclined) you could go out and buy/build a road bike that would share
no parts at all that could be interchanged with (say) a 15-year old model. Folk that understand the way these things work quite rightly resist these (largely pointless) changes; it is (ultimately) bad for the consumer, bad for the manufacturers, bad for the planet.
BTW as I understand it, Darwin's theory of evolution has undergone a refinement in recent years. It is now viewed that in times that are easy, any given species may indulge itself in what might be termed 'pointless variation' and that this will be tolerated, because times are easy. However when times are hard, only some of these variants offer an improved outcome, and survive.
It could be argued that in bicycle design (and perhaps consumer society as a whole) this is a time of 'pointless variation'.
cheers