Dear Thomas,
Thanks to you (and Adam) for the very precise and useful information. But, even if expert set character names are pretty old, wouldn't it be useful to keep them in OT fonts for backward-compatibility reasons. Imagine you have, for instance, an old Word file containing a Type 1 font and its expert set, plus maybe an extra SC/OsF variant (or a titling font). You want to replace this by a new OTF version and, maybe, on the same occasion, import it to a serious DTP app like InDesign. If /fl stays /fl, things might be easier. On the other hand, maybe I'm wrong, as /fl is "V" (?) in the expert font. Just getting a bit confused, I must admit...
Cheers,
Christoph