Honestly, the issue is that we kind of tried, as an experiment, to engage with the thread as a primary source of system design feedback when—as @Thenomain says—it was more a theorycrafting thread and not meant for Arx staff. (This one's largely on me, since I'm the one who really decided to try to engage with folks in hopes of getting concrete feedback before redoing the system.)
However, a lot of this thread has not been actionable suggestions, which... well, after all, it's more a theorycrafting and analysis thread, rather than something focused solely on how to improve things to make stuff more fun for players, which is the focus I needed in my redesign work.
(This isn't to say there haven't been some good suggestions in the thread—definitely ones that we'll be taking into account for prestige/modeling/etc. reworking—but it's not the focused type of feedback that I was looking for.)
Further, it's kind of occurred to staff that "let's pull suggestions from threads on a random forum out there on the internet" isn't really the best path, since that excludes anyone on the game who doesn't have an account here from weighing in on the conversation. Whereas there's a system discussions board on the game itself where everyone on game can, well, discuss systems, which makes a lot more sense to use.
(Plus, beyond the system discussion board on game, I certainly try to always be accessible via page when online, as does Apostate. We may not always be unidle—especially me, if I'm working on code, since I can get Very Deeply Engrossed in my PyCharm window—but I usually try to keep an eye on the staff window when online. So there are avenues to offer suggestions that aren't just 'Discord one of the staffers' or something similar.)
This isn't to say that people can't distill ideas from this thread and post 'em to the system design board on game as suggestions—in fact, that would be awesome, so that really good feedback doesn't get missed—just that we really shouldn't be acting like this thread is a good 'main feeder source' of suggestions on system design, when—again, as Thenomain said—the thread isn't really meant for us.
Staff more formally bowing out is meant more because we kind of had been engaging to a degree that some folks kind of had gotten the idea that this thread was the primary avenue of feedback on system design... which it really shouldn't be.