This is particularly awkward with the dynamics of normal appeals, I feel. The appeals that are the most visible to the community-at-large, get scrutinized, and generate user impressions of the appeals systems, are the ones that go to the council. But these are by far the minority: my estimate is that only like 10% of appeals that get filed end up moving on to Tribunal, because the rest get dismissed procedurally and the user doesn't bother fixing it, or the Arbitrator finds in the user's favor and Staff doesn't appeal (afaik Staff appealing an overturn has only happened one time like two years ago), or the Arbitrator doesn't find in the user's favor and the user takes the L and moves on (which happens a lot). So... the datapoints that are publicized and help the userbase understand the system are all datapoints that are, definitionally, exceptional.
I don't know of a good solution for this. Certainly I would oppose any proposal for the Appeals forum to become generally legible, even in retrospect the way Tribunals are: I think there is a lot of value in appeals being private as a rule for everyone involved in the process. The best I've got is "I keep an eye on all the Tribunal discussion threads and pop in to talk about my Advocate-eye experience of the system whenever it seems like it might be useful," because, well, the Advocate experience of the system is probably the one closest aligned with the general userbase? But most users who wind up wanting to file appeals are not habitual readers of these discussion threads, so this feels a little like bailing with a thimble.