Definitely interesting logic. Could be partly true, but I've never read commentary on it. The confirmed reason is that his potential is weakened due to his injuries. With that said, here's a quote directly from Lucas:
"Anakin, as Skywalker, as a human being, was going to be extremely powerful,” he says. “But he ended up losing his legs and an arm and became partly a robot. So a lot of his ability to use the Force, a lot of his powers, are curbed at this point, because, as a living form, there’s not that much of him left. So his ability to be twice as good as the Emperor disappeared, and now he’s maybe 20 percent less than him."
https://www.vanityfair.com/news/2005...ge-lucas-story
He's said similar things to this a few times (this just being one example)--that due to him being less "living" and more "robot" his force potential is gone. Still quite strong though.