It also doesn't work for people who want to interview speculatively. Looking at what else is around once in a while is a pretty decent due-diligence that you can apply to your career. You can even be honest about this with recruiters. "I'm not sure that I want to change jobs right now, but I'm open to persuasion."
If trial weeks become commonplace, it starts looking like a form of structural lock-in.
If trial weeks become commonplace, it starts looking like a form of structural lock-in.