Microsoft is revolutionary on software development: instead of introducing bugs and pretend they are features, they develop features that are as fucking annoying as a bug.
For example, now you can't turn off Windows Defender. Thanks for making my life easier. Thank you so fucking much.

My windows defender is disabled. Windows 10.

@thmnmlst turn off real time protection, restart and tell me bout it.

There are a lot of users who don't know anything about computer security. They could, for example, become a part of a botnet if you leave them unsecured. As other users stated, it's still possible to disable the feature if you are an advanced user, so I don't see much room for complaining here.