great idea in a perfect world

in the real world, even with the best intentions on both sides, Im wary of these type of interviews. There is an information and power asymmetry between employers and employees - the more your employer knows about you the easier it is for them to keep your salary lower.

for example, if in the course of a friendly interview with your manager you mention how convenient it is that you live close to work, or how you have just obtained a mortgage, they will know that you have a greater incentive to stay (and hence will accept lower pay) than someone in a different situation