Yes, they do all of that. It is by creating a lot of RF in a spectrum that doesn't cause other problems. Certain ranges of RF tend to sound bad, others do exactly what you describe. Either way it's a pretty impossible "sell", so no one claims it.
Measurements show it, too. All known electronics knowledge support it. But most people stand around scratching their heads because if something 'positive' happens, how can it come from something traditionally 'negative' in engineering terms? Well it isn't hard to figure out. First off the positive isn't accurate to real life, but helps give some things back that were taken while recording. In general, with live music that is acoustic, you NEVER get the level of "resolution", detail, or "imaging" that you can with a stereo. Sounds and our ears simply do not exist that way. It's because that low level information is trumped by the actual music itself. However the scale tends to be helped by RF as well, which is often a problem. The panning location is helped too, which can often be soft without a natural environment; and so forth. It gives us qualities we may want, by a different means than you'd expect.
The RF is "retrieving" lower information because it makes voltage growth occur, so the really tiny stuff gets bigger. This also has been measured in various forms, many times. Imagine feeding a tiny pure line through an audio piece of equipment, and grafting a signal to it. Now imagine feeding a fat line through it, that is a skinny line in the middle but looks fat because it has a lot of small RF on it that's high enough in frequency you can't really tell it isn't just a fat line... now graft a signal onto it. That is a complex thing, with many other elements, but should give you a sense of what occurs.
There is nothing wrong with it. It is what it is, and many people enjoy it. The biggest issue is that most people don't understand that rfnoise isn't audible 99% of the time by itself, but the effect it has is... Everyone is under an extremely false belief that they "hear" the noise in the playback (rfnoise & enoise), and not the abberational effects of it (which is what you do hear). Because of that, it's nearly impossible to be truthful about what you're doing with lots of cables, grounding boxes, etc. People won't stand for it because conceptually it's too much for them. For them, RF means the radio in the car, and that's all.