It doesn’t contradict the OT, it (according to a fan interpretation) retroactively adds an unnecessary part to it that gets tied in with something unrelated. It muddles the message and apparently causes some viewers to think that the Jedi telling Luke not to get himself killed in a trap, or to go and fight a necessary spiritual battle, is some kind of moral failing on the Jedi’s part, and not something that is genuinely wise.
It goes from common sense and truth about the virtues of restraint, patience, self-control, perseverance, etc. to “oh I remember this, they got mad when Anakin wanted to have a girlfriend or save his mom. This is more of that.” It’s a cheap oversimplification of the factors going into the story. It becomes less about the impetuousness and vigor of youth vs. the patience and experience of old age, and more about the weird stereotypes people project onto the prequel Jedi.