I don't like DRM myself but there are a very large number of users that like to use services which wouldn't stream content otherwise. Just like any protection mechanism it doesn't have to be perfectly impossible to break to provide value to someone.

The nice thing about the way EME was implemented is if you aren't one of those users you can simply disable Widevine or (if you prefer to not even have proprietary code on your computer) use a build that doesn't include it.