I understand what you're saying, but this anecdote just confirms to me that Amazon's UI has the correct focus.

As long as you can very quickly and easily buy on Amazon because it's cheaper and perhaps other reasons like the delivery story, returns story, customer services story etc are all better, then the UI in service of the UX is doing its job really well.

They're not (necessarily) optimising for you searching for products or finding more detail about products, they're optimising for you buying the products. They very likely care zero if you did the former elsewhere, because why would it affect them if you did or not, you still bought with them.

Searching is very important factor. For simple things i can search in amazon but if i have to drill down like laptop, computer parts, mobiles its practically useless. Which then makes me check their competitor which is a huge fail. Now you have sponsored ads between search which don't respect the search filter. I am actually buying more in flipkart these days then amazon.