You also have URL shortening services that could trick users into visiting a page that is charging per page view. Unless there were a way to authorize the payment, the system could be abused. Then we're back to managing 100 clicks per day.
Charging per page view would only work for pre-approved sites and have many of the downsides as ads, not sure I like that idea at all. Also micro-transactaions are not necessarily about payments like we are used to them now, but could completely transform how donations worked.
And also paying after the fact, did you like the content? Pay. Not have to wade through ads "paying" for something that turns out was only clickbait, tracking and garbage.