Remember when amazon sold just only books
The convience is just too much now, I've been a prime member for close to 10 years now but I clearly remember before that being damn near afraid of buying anything online, first place online I ever ordered something from was eBay. Only really tested Amazon cause of the college discount option but haven't looked back after that, I have Amazon dash buttons all over my place and now when I go to buy something that is not food, I price check it on Amazon first.
Outside of convience I think a overlooked thing Amazon is being able to see reviews (written, pics and videos) by other people, back in the day with a new item if you bought and it sucked you had no way, outside of word of mouth knowing that it did
Which leads me to my final point, customer service, there shyt is top notch, how they pull it off I have no idea, but anyone knows that the worst part of physical shopping is having to return something
I've literally bought something, used it, decided it was junk, waited 2 months, messaged Amazon and returned with a full refund.
I've bought something it didn't work as intended, hit up Amazon got a full refund and been allowed to keep it
No dummy teenage customer service rep at a box store, no stockin fee, none of that, only a quick trip to UPS