What you’re going to end up with if they’re allowed to sell across state lines that they’ll concentrate their legal base of operations in whatever state they can most easily find a pliant state legislature to do their bidding. For the example, see North Dakota and the credit card industry.
NO.
What you’ll wind up with is buying the best deal you can find, like North Dakota or Mississippi, who have good rates due to their market friendly public policy.
Only idiots would buy health insurance from New Jersey, New York or other Northeastern States. The red states will have the best deals.