The deprecation policy requires waiting at least one release since hard deprecation before removing stuff. But the version put in wfDeprecated is the version it was soft deprecated in, so unless you git blame/log, you don't know which version it was hard deprecated in.
We should come up with (and then require) a syntax to indicate when stuff was hard deprecated in.
// Hard-deprecated: 1.32 wfDeprecated( __METHOD__, '1.31' );
Or maybe just make it an unused parameter to the function? ...