Earlier quoted context omitted.
> Like many UI related assertions, absolutely no concrete evidence is being provided to support this point. Microsoft did massive amounts of user testing, just because you don't know about it doesn't mean it's not there. This is a good starting point if you have about 20 spare hours: https://docs.microsoft.com/en-us/archive/blogs/jensenh/ They also backed their tests with a ton of data and metrics.
Testing and metrics can be wrong like in this case. A ton of data can be too much where we find patterns to reenforce what we want.
I'd bet on Microsoft's approach over these rants, every day of the week.