The reason I added `form-aligned` in the first place is that from experience and talking to a few users, that form implementation is particularly popular. If we decide to omit it, I'd like to do one of the following:

1. Add that implementation to a possible form-extras module in the gallery, with less common form styles such as appended/prepended buttons.
2. Try to see if I can create a similar effect using a combination of forms and grids, and highlight that as an example (similar to the multi-column forms)

:+1:  on the `form-stacked` instead of `form-primary`.