Regarding lightsaber physics, I believe the official version is that they basically have artificial inertia, because the blade is in constant motion (and as such does have an edge), and this is mainly used to justify really lengthy wind ups for attacks (like what Kylo Ren does). On the other hand, we see plenty of Jedi fighting like the things weigh nothing, so I think it’s a case by case basis to justify fighting styles, rather than fighting styles being derived from it
The specific logic is that lightsaber physics changed over time, during the development of the films. When Lucas was working on A New Hope, he approached it with the idea that the actual blades were quite heavy. As in the actual projection of light/plasma/whatever had substantial mass. Though from here on out, I’ll be talking about the actual props.
The stunt choreographers patterned, their fights off a mixture of 1940s Hollywood swashbuckler duels, modern fencing, and kendo. There were also other factors, including that the stunt blades themselves were quite fragile. (I want to say they were made of fiberglass, but I’m not completely positive.) I’ve also read that David Prowse had a bad habit of breaking his lightsaber blade on set. This is part of why the style in ANH is so tentative. The actors are trying not to break their props. Also, fun trivia, you can see them knocking dust off their blades when they come into contact in ANH.
Some of this logic carried over into Empire Strikes Back and Return of the Jedi. I’m not sure exactly how much, but you can look at all three as a coherent unit. One of the few big changes was much more durable lightsaber props.
In going back to do Phantom Menace, the stunt choreographers came to Lucas and said, something to the effect of, “look what we can do, if we one hand these things.” The result is much faster and flashier combat, which you can see in the prequels. As I recall, the specific justification from Lucas was that the Jedi were at the height of their martial training before the purge, so you’re seeing the best lightsaber practitioners in history.
To be fair, I don’t know what the thought process is for the lightsaber use in Awakenings.
The important takeaway is, that how lightsabers function has changed to fit the capabilities of the film production staff. So, trying to extrapolate something coherent out of that is going to be kinda tricky. Still, kudos to the EU writers who made a genuine attempt, and kept at it as the entire approach was reworked as the prequels released.
Incidentally, TIL there’s a quick post keybind that I hit with my pinky when I went to hit backspace. I still don’t know what that keybind is, but at least I know it exists now.