Advice against "constant handle"?

[Luashine]

As a part of #73 I was going to add this note, but decided to look further into "why":

+@note You should not initialize game sounds as constants in Jass (why?)

In a reply there moyack says that the problem he had was due to a constant sound handle. He had an issue after loading a saved game.

Searching further, all I really found were posts on hive like this:

You shouldn't use handle variables as constant globals, make them nonconstant.

And then the only interesting discussion here, where nobody understands the logic of constant vs non-constant functions, and for handles only the issue with "wc3mapoptimizer" is pointed out (wrongly constant-folding handle variables). Though that's different from whatever bug moyack had after game load.

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Basically, does anybody know what constants are good for (except basic types like int)? Should we add a general warning to handle type? (and then each descendant type too?) to never save handles as a constant?