That last point you make is crucial. Your average user just wants to go “on the web”, but doesn’t really know any difference between one browser or the next. This is why IE6 thrived, plus companies adopting it as their default install.
Exactly. Talk all the shit you want, and we can do it all day with IE6 but it did what people needed and it hit numbers north of 90% and had staying power unlike any other browser/version pair since.
If you want to understand how humans relate to technology, writing such things off as irrelevant, simply because IE6 was technical swiss cheese, is foolish.