When I added move constructors and move assignment operators to some ICU C++ classes, I made them conditional on having C++11 compiler supported, and I also added moveFrom() functions that work with older C++ versions.
See for example UnicodeString::moveFrom().
Now that we require C++11, these are redundant with using std::move().
We kept these @draft. We could remove them, forcing anyone who was using them explicitly to switch to standard C++11 syntax.
Or, we could decide to keep them and make them @stable, because they are "harmless" and nicely explicit – but we would perpetuate two ways of achieving the same thing, a standard way and an ICU-specific way.
I assume that we will not want to add moveFrom() functions to other classes if & when we add move support there.
Discuss which way to go.
Somewhat related: #13585
approved:2019-01-30 ICU4C API proposal: remove still-draft moveFrom() methods