Why are Windows 10 updates so slow?

Windows 10 users are well aware of the fact that installing updates can take a long time. In fact, you’ll find many users venting about this issue in online forums and complaining to their service providers. So what kind of feedback are they getting, and why are Windows 10 updates so slow?

Why do updates take so long to install?
Windows 10 updates take a while to complete because Microsoft is constantly adding larger files and features to them.