[hn_check]

Deprecation is too kind of a word. Traditionally deprecated means that it is no longer a best practice/canonical. It's nice to see deprecated flags when building new code because you know you found an out of date bit of documentation and you should look at what may be a better approach.

Deprecated APIs, functions, etc, in many orgs hang around forever. They might not be ideal, but they still work for code written before (or even code written after that might have some perverse reason).

Google (outside of Android) doesn't deprecate, they rip it out. It makes things easier for them, as this post details at length, but it makes it harder for the rest of the universe.