Why are Google Search URLs so terrible?

Google perform a vast amount of tests for various groups of its users at any given time. These parameters are used to help them know what part of that group the user is, and probably other things.

Sure, there URLS aren't useful for us, but they are for them, sharing a Google search result isn't as easy anymore, but who tends to do that anyway? You'd probably end up with different results if you're logged in to a Google Account and the location you're from.