I think it requires something very special for an organization to accept to canibalize itself. Apple is the only exemple that I would see at a behemoth scale.
But most of these issues are plaguing every other major site. Ads that stick with you for days and days whatever site you look at are becoming the norm.
No ec site review system can be trusted in my opinion, they are usually way to easy to game. For anything that actually matters reputable and dedicated review sites end up to be the most useful.
Different sellers and different price are fine to me, it actually helps to mitigate the knock off issues in my experience.
All in all amazon has degraded a lot in these aspects, but I feel the whole industry took the dive and don’t see competing retailers coming up with fresh ideas.
How are they doing?
Other things I've stopped buying from Amazon are the frequently-counterfeited categories of items (USB chargers, etc etc). I'll just go to Microcenter or Walmart or wherever local whose supply chain I have more faith in.
Agreed that Sears never moved much beyond the 1970s in store layouts and merchandise display/organization.
Their stores were also a hodgepodge of junk all randomly mixed, and they never made their store a desirable place to stroll.