Regulation that protects the consumer while simply asking that the final price is displayed anywhere shouldn't really be controversial, it just seems that in the US these tricks by retailers have been so widespread that it's now normalized.
Aside from that, this law would not eliminate the need to do math. The sales tax would still be added. Despite "the price you see is the price you pay" slogan, it excludes certain government taxes and shipping fees. That exclusion includes sales tax.
I'm sure the next decade will be full of litigation to decide what counts as a "restaurant" and what counts as an "add-on fee" and every business owner is just going to try to skate on by with the status quo using technicalities and acksuallys.
Probably the core of the disagreement here is different definitions of "fraud". For me personally, information that is misrepresented and hides behind the mask of an unreasonable amount of work to be correctly understood is a form of fraud, and I know others don't share that definition.