Right click the update icon, select whatever option takesyou to the settings screen, on the right-hand side you'll find a link for changes in each update. It's not transparent, but it is available.
It's also to a large degree security updates which are important as hell.
Just look at apple to see what happens when security updates get neglected. Newest apple phone actually had a security exploit that allowed people to upload viruses to your device without you ever having to interact with the virus.