Well, you would be wrong.

Every step between a customer and completing an order is a loss of sales.

If Google can measure how many people they lose by a millisecond of added time between a question and a response ( https://www.forbes.com/sites/rogerdooley/2012/12/04/fast-sit... )...

Then there has to be some sort of measurement out there on how each step causes cart abandonment (or whatever it's called).

Its the same reason sites add Single-Sign-On... click click, I'm on a website... vs filling out forms, verification, etc...

Yes, but adding 1-click also inserts an extra semi-step into every purchase: the choice of whether to click the 1-click button or the add to cart button.

Apparently Amazon finds that adding 1-click does more good than harm.

Like the article said, Apple licensed the 1-click patent from Amazon in order to offer the same frictionless experience to iTunes shoppers. This was for music sales, before the iPhone was even a thing, if memory serves me right.

Well since we're using anecdotal evidence, I would certainly buy from more stores if they had one click. There have been countless times I've abandoned a shopping cart because there was too many steps

Amazon didn't start out as an online retail behemoth. There was a time when that patent made them more competitive, especially in the early years of the online shopping experience.