if it would work correctly it's acctually a grate UX boon for the user
basically you don't block any bandwidth while a user is using the computer and instead when they are not
also you download slower (less bandwidth) in the background because you have much more time available to download it (like e.g. the whole night)
this feature is also only about downloads, that windows tends to force apply updates once they are downloaded is a different unrelated issue altogether
so theoretically especially for laptops which are only used idk. 1-2h max a day for people with not so fast internet this could be grate
could because it isn't, due to implementation details
e.g. you would only want to run this if you are: plugged in (power), the internet is reliable (at least as reliable as "normally" for any given network) etc.
but AFIK it doesn't really detect changes in power status, doesn't detect bad natwork conditions (which can lead to increased power use), and probably doesn't use "intentional slow" download either
you also can't opt out
so yeah it seems shit with how it's implemented -- but the idea by itself isn't bad