HoloLens really needs to support multiple accounts, especially for developers
My company loaned me the company HoloLens to take home and teach myself to develop for it. While I had it, I installed an update, the device rebooted, and BOOM! No longer could I use the device, because it needed to be logged into by a personal Microsoft account (the account setup by the first person in the company to set it up, aka the company owner). I ended up having to restore the device to be able to log in, losing all the data stored on it at the time. And now the device is tied to my account.
This is a problem. Few small companies are going to buy HoloLenses for all of their developers, so the devices need to have some correct way of supporting multiple users, even if that way involves logging out one person and logging in another. The only good current solution I can think of is creating a fake Microsoft account with an easy-to-pass-along password, to use as a shared account by the company.