Ever since I hung the Ruckus on the wall, all peripheral coverage issues disappeared. At that point, I decided to try re-hanging the old MikroTik cAP AC (with the wave2 drivers) in the same spot to compare.
All in all, it performs well there too, and all devices remain stably connected, albeit with a lower signal level. I imagine, however, that if there were 40 devices, I'd already see some differences.
Now I'm curious to test a cAP AX...🤣