Eh, the requirement to return your work-provided laptop is about as strong, legally speaking, as a requirement to pay back the value of it when you leave. Perhaps even stronger (because a work laptop is never really even a loan to you). I would suggest your workplace is a bit of an outlier: most places I'm aware of make pretty sure the laptop is returned, even if only because of the risk of company information leaking out otherwise (some places I know might let an employee keep an old laptop that's being replaced after they have wiped it, perhaps with all storage removed entirely).