Alert Luddite warning
Wears the profit.
The cynic in me thinks change for change sake, else we'd just buy very few spares on our 7 speed uniglide bikes. Just trashed rear mechs or wear out the inner Chainring on our triples. Rims d brakes blocks as well. Then shimano saw potential in Over-Under engineering, (did I really say that. ). They really drove the mountain bike market, Lighter & more ratio sell! .
Slicker gear changes sells.

(I'll give them that)
light weight sells,
(ahem Keep quiet about Reduced durability, we're not campag)
'Wanting' durability, sells!
- he's lost it...
NO, Ahar, It sells workshop time & spares..
Get the local bike shops on board, after they've got endless complaints a requesting money back.. about broken sub standard, I bought 3 months ago...
( Never mind, the quality, feel the price..).
Then next year, you need another bike 'cos it all lighter and shiny and honestly its cheaper than fixing it.. Sir..
Old skool,sold you a very expensive durable bike, for life, Xmas rush( ££profit), and used bikes, £. "
Ticking over, new chain & brake blocks, broken spokes & annual services, except custom wheels for the rodies"
New skool lighter, light cheaper bikes ££, ('we're almost giving it away' , we'll tell 'em that!) increased sales, lower margins££.
Loses of used bike sales(don't handle stolen bike tale or not worth hastle) . Busier workshop £££ lots to fix frequent customer in buying latest tat in the shops - every one's happy.
On the double or triple chainsets the inner front ring wore out. But only after shimmy reduce the size of the rear cassette, possible now it wasn't a freewheel.
Suntour, campagnolo & sachs*chains, Mavic (now part of Sram) were bigger players in each segment than shimano and proud of their tech & Eng. expertise, thus reliability outstanding, compared to shitmano, they were was legendary Think Saab rather than Ford (Fix Or Repair Daily).
They used to say 'Campag wear in, shitmano wears out.'
Marketing driven Technological improvements, for change sake, packaged as Innovation - else sales would flatline..
Or how to design & engineer something properly.
"The right way, the wrong way & shitmano way."
I'll stick with my 9 speed Sturmy Archer. 3x3 at back. Yes cyclo really made it, in the 60's. Fair tools - Birmingham, well mafe for the time..
Actually I now have a 'Rohloff speed hub 500/14 DB.' 1 changed the rim after 12 years, v brakes. (Exciting when dirty or wet, no tittering please

) . , reversed the rear sprocket & replaced the chain with the Chainrings. A few tyres, Not bad after 20 years. I have logged mileage maybe 25k
(My first adult bike original bike is still going, Suntour, a few new chain & change of freewheel to 6 speed, down friction shifters, and upgraded to triple chainset, my knee couldn't handle Pennines (Yorkshire hills), it must have 25k miles on it by now, gone to a mate).
Wears the profit!!
I hope you think you know, what I might of exactly meant.
Warning - may contain value odded typos & ither mythspellings..