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They need to learn when to use history.pushState vs history.replaceState

Or, how about not saving the location in the URL at all when moving the map? I guess there must be a reason why none of the mainstream map webapps does something like this...

Others do this too, just using replaceState.

It allows you to copy and paste the url to link someone to what you're seeing. It's a good thing if sone right.

Also, google maps changes the url as you pan and zoom.

it tracks everything you do while interacting with it -- FEATURE?

Thanks for pointing this out! We will look into fixing it.