You essentially get rolls in the plane of the galaxy, which are like giant tube vortexes. The gas preferentially goes along the straw instead of leaving the tube due to magnetic effects of large scale swirling in the galactic plasma.
Sort of like a filament forming in a plasma globe: the plasma preferentially travels along (well, swirls with) the filament.
https://news.northwestern.edu/stories/2022/11/the-milky-ways...
https://www.space.com/meerkat-milky-way-mosaic-filaments
https://arxiv.org/pdf/0901.1165.pdf
I would say that for the dynamics of galactic plasma, you can’t ignore any interaction: kinetics, gravity, nor EM. They all interplay, within a system.
Electric/magnetic fields in the galaxy are known to play important roles in its structure; but where the “plasma cosmology” tends to go wrong is asserting that EM is the dominant force that explains the galaxy or larger structures.
Personally, I think this is somewhere we’ll need a unified theory to decide: we’re seeing effects that look like gravity and look like EM, depending on how you squint. Which is unsurprising, as they’re happening around a black hole.
However, Alfvein cosmology does have merits in explaining galactic scale phenomena and solar phenomena certainly have a electrical component (see: huge quantities of charged particles berating Earth at all times).