The argument against this, specifically with regard to taxes, is that baking in the tax conceals the impact of that tax from the consumer. Obviously this primarily applies to sales taxes since production taxes aren't consumer facing (even if they impact consumers) but it's still better imo than simply not having that information since most laws are already fire and forget type affairs and so their costs can compound over time to degrees that aren't as immediately obvious to the public if they aren't displayed frequently and visibly.