After our meeting yesterday, I went digging to see what would need to be done to support the new app. crit. features in the stylesheets, and found that actually the support probably isn’t really up-to-date even for the current phrase-level-only apparatus (e.g. no support for @source; no support for <rdgGrp>s). I’ve made a bunch of updates that support, e.g., lines inside <app> and transpositions, but then on further investigation found that even though the existing app-handling has a couple of tests, they’re never run during testing, and there are no "expected-results" artifacts, so we can’t know what they’re supposed to do or if any regressions have occurred. There’s rather a lot of work to be done to produce output I’d consider acceptable. Given that state of things, I don’t consider updating the stylesheets to be a blocker for getting the app. crit. updates into 2.9.0. I do plan to work on it, and I think I can promise it will be better even in the upcoming release, but there’s a bunch more work to be done. It’s not really surprising: I bet anyone who’s doing critical editions is developing their own custom displays anyway, so these have never gotten a real workout.