That's not always because of anything intrinsic to the Web. We know that ordering a pizza isn't any more complicated than what can be represented on a paper form. Forms can also be capably represented in a browser. The problem is that app developers are by and large not capable of distilling the requirements down to what is necessary and sufficient for the task at hand. Instead, they're foolishly preoccupied with what they consider to be the mandate to deliver experiences.

In short: most devs' simulacra suck.