I don't understand how this is considered pollution.
How is this different from having a separate page per slide? It seems we have the same result but with a better user experience. Isn't this a feature allowing each slide to be linkable? Why is this considered negative?
Depending on the browser there is no problem, as in some browsers it is completely impossible to navigate to the next slide at all. When exactly did accessibility and standards conformance become unfashionable round here?