Indeed, otherwise there is a cost time and sometimes money based on that time to the job seeker to find out what the salary is.

For the employer this may suck because existing employees will see rates/market and if they don't have an open salary policy it could cause issues.

For the job seeker, you might also want higher and not go to a place that may decide to pay you higher based on experience and skills.

A range is probably the best but a number puts job seeker and employer closer to the deal just by seeing the numbers.