I only have used them in C++/WinRT, as they are a kind of required to handle anything WinRT, and it was kind of ok when doing UWP, although it was much more complex as in WinRT case, it also takes into account how COM/WinRT compartments work.

See https://devblogs.microsoft.com/oldnewthing/20210504-01/?p=10...

Don't miss it.