One big problem with your argument is that the word "yet" should be added almost everywhere. And in fact other responses have pointed out that there are plenty

One big problem with your argument is that the word "yet" should be added almost everywhere. And in fact other responses have pointed out that there are plenty of places where ads are delaying interactive purchases. It's only a matter of time until it is in almost all the places you mentioned. For as long as there's no good pushback/regulation, there'll always be someone willing to pay to insert ads somewhere and someone willing to accept their money, because there's almost no immediate downside and the amount of money offered keeps going up until you fold. It happens continually, everywhere, that more and more ads, and more and more intrusive ones, keep appearing, and defending the status quo won't help us.