Not to negate your point, but a related pondering : I would assume that the Venn diagram of companies that make claim on property created on their laptops ; vs companies that let you install fresh OS and software from image and repository of your choice and access work network / store proprietary data ; is practically zero.

(If you did not install fresh OS from image of your choice, then you did not install software from scratch and should not be confident what's in your work laptop and what it's doing / monitoring)