Why should I have to go through the entire process just to see the price? Have you ever been in a store that has the tax added onto the price tag? It is very nice to not have to do mental math.
I think this is the crux of our disagreement. In my experience, the more degrees of freedom the seller has, the more chances to fuck you over they have.
I think - and this might be my European perspective and maybe why we feel differently about regulations than Americans - the main source of risk is corporations trying to take advantage of you, not the government. Curbing said risk through regulations is a core part of good governance.
[0] https://ourworldindata.org/grapher/median-income-after-tax-l...
[0] https://www.usnews.com/news/best-countries/best-countries-fo...
And all of these are definitely worse than just making the vendor behave properly...