As a British person this is always so alien when traveling in the US. You could go one step further and suggest that perhaps tips which are practically mandatory should be included in the headline price but that might be a step too far.
I definitely believe that you should be able to purchase something for the advertised price. Maybe that is "starting at" but you should be able to check out at that price.
one of the breweries i live by recently moved from non-tipped to tip, and it's generally a disliked change from what I hear because most of the time the brewery is open it's not busy enough to make up for the loss in wages, and then people fight over the really busy shifts.
I also think "plus Tax/Tax included" should be featured more prominently but I think that businesses would likely do that themselves given the conditions above so that, when comparing prices, you would very noticeably see that whether tax was included or not in your price. ie, Amazon would put in green letters near the price "Tax included" so when I compared their price to another place I would know why Amazon's price might be higher.