The minimum salary paid for a position is useful information. The median or estimated median may be as well. Legislated disclosure of a maximum is useless. It implies that employees are interchangeable widgets with a cap on their market value that isn't more than some reasonable percentage of the minimum.

There are true superstars out there that some companies can afford to compensate properly, but they are generally remarkably atypical and their salary is irrelevant to what a person of ordinary talent and experience can expect. I think it is great that some of them are worth and can be paid nearly $1M / year, but I wouldn't expect that to be relevant to the salary negotiation of most engineers taking a job with similar duties.