@me Over the weekend I was messing around with ibuffer, integrating my custom ibuffer groups with @sanityinc's ibuffer-vc (recommended).
I was surprised to discover that documentation for ibuffer (in since 22.1?) is ... sparsely documented. But it was fun to get it working because the code (and Steve's add-on) is
PERFECTLY LIMPID
(the real story here is that I have been waiting a lifetime to drop the phrase "perfectly limpid" for internet points and here is my opportunity)
@jameshowell @me @sanityinc I also use Ibuffer but I am slightly annoyed that point changes on auto update (in contrast to Buffer-menu-mode). I would like to fix this sometimes.
@minad My annoyance with ibuffer:
The filter groups are defined as a list (of lists), which (per the definition of list) has an order.
That order determines the logic of which buffers get assigned to which groups. That order also determines the order in which those groups get displayed.
Sometimes I want those orderings to be different. Which would require two lists.
Each element already has a name string, so a display-order list could reference elements in the filter-order list. But that gets complicated when some of the elements are generated dynamically, like from ibuffer-vc.
This annoyance is probably not worthy of the effort to rewrite the package with a different abstraction. Especially not the effort to do so without introducing breaking changes.

A butler for your buffers. Group buffers into workspaces with programmable rules, and easily switch to and manipulate them. - alphapapa/bufler.el
@minad Agreed. I think the point to stress here is that users can decide. Hydra, for example, always struck me as relatively bloated, buggy, and a little too idiosyncratic with respect to (at least my mental models of) Emacs internal and UI conventions. But obviously it was very popular! Let a thousand flowers bloom. Cherish the Four Freedoms :-)
@minad I mean I would never dream of using evil-mode. But I am glad that evil-mode people can depend on evil-mode. Follow your nose to the Emacs that is your Emacs.