Well, I might as well eat my hat. Just tried running a whole bunch of these addons actively sharing data, at the same time (stats and ultis.) A grouped raid in Cyro' for two nights. Other than some meaningful sluggishness (that I don't have without this setup,) I had no errors, crashes, or disconnects of any sort.
Surprising. Could be more luck than brains, but that's that. At this point, I agree that this is a discussion rather than a bug-report.
As usual, well done siri on pushing to clarify this.