I built a browser extension to help mitigate this type of issue. A lot of people like to think about the cost of lodging in terms of nightly price as opposed to the total, so the extension shows the true nightly price of a stay, after account for all fees, taxes, etc. Unfortunately, right now there's not a great way to get the true* totals to show up in search results, but the extension will show you the real price per night of your stay once you're on a place's listing page.
I'm more forgiving about taxes being left out, only because it's an equal percentage for each listing. If I have a map of 10 listings, and they're all N% less than they should be -- I can still somewhat easily compare them, as they are all equally wrong.
There might be edge cases to my thinking, as if you map view listings along a jurisdictional boundary, there may be taxes in one city and not another.
There might be edge cases to my thinking, as if you map view listings along a jurisdictional boundary, there may be taxes in one city and not another.