Of course there are many factors that go into good sound. What matters most will vary case by case, design by design.
The Ohm Walshs are essentially a "black box" in the sense that transducers are totally enclosed (in the can) and out of view. That makes for a lot of wiggle room that would not be tolerable aesthetically otherwise.
I hear the beautiful music but all the ugly parts are out of view.
Kinda like just driving a car versus looking under the hood. I will look in there for routine maintenance or if I suspect a problem but that’s about it.
Also I think we are talking about refurbed Walsh 4 cabinets here, not new cabs.
My F5 series 3 OHMs use refurbed OHM F cabinets, which was a big attraction for me. Many still regard OHM Fs as one of the best speakers ever (at least when they were not broken). So the cabs cannot be too shabby. The drivers are much different but the topology relative to the cabs is essentially the same although most new Walsh speakers are ported not sealed. 5015 models with powered subs on board are the exception.