OTOH, there's already the extra burden of establishments placing no weapons allowed notices. Six of one / half dozen of the other. Example: In an open carry state, I saw a notice at the door of an establishment that stated open carry wasn't allowed in the store. It caught my attention because it said nothing about concealed carry. Had they not posted it, customers in that local could have opened carried on the premises, implying the assumption is that it's allowed unless prohibited by the owner or by state and federal law. Why not turn the assumption around and assuming it's not permitted unless there's a notice by the owner?
If a store owner wants to enforce a set of rules that are stricter than the state & local laws, then the onus is on them to take the effort to effectively communicate that to the public.
Otherwise, what's the limiting principle?
"There's no sign explicitly saying I
can wear sunglasses into the store so I'll assume it's not allowed until I get clarification, I guess I'll have to get online and try to hunt down the store owner's phone number so I can give them a call and ask if that's okay" isn't a practical arrangement.
From a practical standpoint, customers can't be expected to anticipate every possible house rule a business might have. If a store bans photography when state law permits it, or requires masks when there's no government mandate, or prohibits certain types of clothing, customers operating within the bounds of the law have no way of knowing unless they're told.
From a legal perspective, many jurisdictions recognize this through concepts like "adequate notice." For rules to be enforceable (especially if violation could lead to trespass charges for refusing to comply), courts often expect businesses to have provided clear, visible notice. That's why you see posted signs about "No Shoes, No Shirt, No Service" or specific photography policies.
The counter-consideration is that businesses do have broad rights to refuse service and set conditions of entry on their private property. But the exercise of that right typically requires making those conditions known - through posted signage, stated policies at entry, employee communication, or website disclosure.
The "ambiguity favors the store owner who can kick people out and press charges for trespassing based on rules that were never communicated" isn't one that people would like if taken to it's likely conclusion.
The first time a store owner (with an affinity for the confederate flag) pressed trespassing charges on a black guy for a "no <insert garment here> rule" (that had never been communicated before), I'm betting those progressive lawmakers in HI may have some objections to the concept.