Hey there Leo - really ANY of the use-cases with the Go FINDTITLE enhancement that was just delivered (thanks again for that)... where I can't use native "Go" arguments that would otherwise be available (like CURRENT or FROMSEL args) because I'm doing a FINDTITLE or send args to a user command.
Any other scenarios I've come up with in the past have mainly had to do with sending the current path to an external app or rename script, but which then does ~something with the info before it calls back into Opus through dopusrt. In those cases, it didn't really have much downside and was otherwise just an observation. I think I lobbed in a comment or two around it during the beta period, but can't recall my details at the moment.
I'm going to post my results in using Go FINDTITLE with the embedded command feature to get a ~floating Find Window shortly - now that I've been using it instead of a dedicated Layout... That and any other use case where the root of the library is involved are the only scenarios I can think of at the moment where it creates an actual ~problem as opposed to just a visual or navigation annoyance...