I'm gonna address this point. As the rest is largely asinine.
So for 870 years. Yoda was able to jump super high, do backflips, so on so forth. In 30 years. he went from that to a crippled old man who could barely walk. What you're describing is someone who's 87 and is a peak physical athlete. Mike Trout level. And then 3 years later is a crippled old man. It's not like he was slow moving etc. He was hobbled and crippled. It didn't make sense.
Obi Wan was slow because he was an old Human. He was about 27 (or in peak physical shape for most human athletes) to 57. And he was never limping or anything. He just moved deliberately. It's not remotely comparable to Yoda.
And for as far as the force goes. Yoda says Dagobah is the most pure place in the Galaxy for the Force. So the idea was that Yoda was even stronger with the force at that point.
Again the issue here is we had an opportunity to see something totally new and different. And instead saw something totally unbelievable.An 870 year old largely immobile in 30 years Yoda doing flips and **** battling a 54 year old Man who can jump around like a monkey. It doesn't make sense to have done it that way. If Palpatine could move like that why couldn't Obi-Wan in the originals? We're talking about physical limitations. Not force limitations.
We could have instead of seeing a ridiculous lightsaber battle then Pod chucking, seen new uses for the force. Stuff we couldn't even conceive that would have blown the mind the same way force choke and lightning did when you first saw them.
Your comparisons are ridiculous.
Obi-Wan and Yoda had not used their peak powers for more than 30 years after ROTS. I believe the novelization of ANH or one of the original movies has a blurb in there about a Jedi not using his powers for a long time, it becomes stagnant and weak.
Both went into seclusion. Yoda and Obi-Wan both had become stronger with the force, in the sense that they had learned what Qui-Gon had which was to become immortal and one with the force (force ghost). That's why Yoda mentions "the path to immortality" and training to Obi-Wan at the end of Revenge of the Sith. That's why when Obi-Wan says to Darth Vader on the Death Star "You can't with Darth, if you strike me down, I shall become more powerful than you could possibly imagine" he's talking about becoming an immortal force ghost. Now why Anakin had become a force ghost at the end of ROTJ is iffy but I'm not gonna nitpick that.
And you're questioning things about the Force that the series has always been strong about. Those strong with the force, no matter their physical deficiency can maneuver themselves incredibly. Thats what the force is, belief. And on top of that using the energy that life surrounds the body with and harnessing that.
Yoda was walking with his stick and hoverboard in the prequels, but when it came time to fight the force was strong with him. It allowed him to do those "crazy jumping abilities". I can imagine Lucas felt if Yoda were in his prime he would have been even faster. Palpatine was physically deformed from Windu but still just as strong as ever. I do believe by the end of ROTJ Palpatine's powers had stagnated.
Also, Luke is the only known Jedi to have survived a direct attack of force lightning like that in ROTJ. Either Palpatine's powers had weakened, or Luke was just so powerful naturally with the force that he survived what Windu could not.
Lucas has always said in interviews, commentaries, etc. that he envisioned Yoda dueling with a lightsaber when he made the OT's, it's just in the OT Yoda was a puppet and it could not be realized until CGI had become proficient enough to do so.
And as goldfly said earlier, the Jedi are based off of Samurai (actually you could say Star Wars was heavily inspired by Akira Kurosawa's Samurai movies) whom used their swords to duel to the death. THat's exactly what any force users Jedi/Sith do. So I'm glad he put Yoda-Palpatine lightsaber duel in between Force Dueling.
Even during the animated series, Palpatine as Sidious is actually fighting with lightsaber. So it's not comparable to Obi-Wan and Yoda whom for the most part had become isolated hermits. Dooku during AOTC and ROTS was around the same age as Old Ben in ANH if not older. But he kept his craft current and didn't take off for 30 years. That's why he was able to defeat Obi and Ani in EpII, and held his own for a while in EpIII.