Yeah except that Owen is too close-minded to understand it all.
If Luke didn't train to be a Jedi, he would've eventually been discovered by Vader or the Empire as his Force powers would've manifested sooner or later. Without the proper training, he wouldn't know how to control them and would probably accidentally draw attention to himself. Fact is, Owen was being selfish and just didn't want Luke to grow and be different to him and more like his father aka a Jedi Knight and also selfish because he knew Luke could definitely help the Rebel Alliance stop the Empire with his Jedi powers but he'd rather Luke remained a petty farmer in a world with little future for him.
^ I don't know if Owen knew that Luke was basically the Chosen One who could save the Galaxy. He just seems to know that Luke was a potential Jedi like his Father.
Regarding Luke training much earlier, Sam Witwer gives his opinion on it on Collider Jedi Council this week, saying they(Luke and Leia) couldn't be trained at a young age, because they were too powerful and the Sith would sense that. So the Jedi were waiting for them to grow up, be old enough and competent enough to defend themselves, and then to be trained as quickly as possible.
Yeah I mean he didn't know Luke would be an all powerful Jedi, but he certainly knew he could help the Rebellion a lot and could potentially be a powerful Jedi and have a much brighter future than just farm in Tatooine tbh.