What a ridiculous comment.
Browsing the web requires you to mostly read text. You should also tell all those office workers, writers, students, professionals etc.. who use word processors that they should be typing away on an iPad instead.
You're lumping several use cases together in your response. "Browsing the web" is a singular use case. If that's all a person wants to do, a tablet would be a perfectly sufficient (and much more affordable) way of addressing that specific need.
Writers, on the other hand, would have a use case of word processing or publishing. I'll be the first to agree that the tablet form factor generally isn't the right device for those use cases. Those people need something with a keyboard. But do they get a benefit from the higher resolution when, for most of their apps, it doesn't translate to more usable space? A writer, for example, would need to double his or her font size to actually be able to read what they're writing in native 2880x1800 resolution on a 15" screen.
I guess what I'm really getting at is that it seems like for text-based purposes, the higher resolution is only a means of making textual elements appear smoother, but not to actually increase the usefulness of applications that work with text.