Just a question of cost/benefit I think.

In long-established and stable industries like these, regulation can benefit the consumer and we can trust it will still mostly make sense five years from now.

But when industries are evolving quickly, nobody knows which regulations will actually create benefit or harm to consumers (law of unintended consequences) and by the time they're written they might already be out of date.

I agree with your principle, but I don't think transparent pricing is an item that should fall under that umbrella. It's just basic honesty.

The price you advertise is the price it sells for, otherwise you have committed fraud. Seems clear to me.