Interesting how a fair number of people see Vader being Luke’s father as, perhaps, not a great idea. Far fewer people thought this in the last century I would bet.
It was a great idea, but the follow-through was woeful. A certain point of view? No, I think Obi Wan should have revealed that he had promised Owen Lars he would run with the ‘Vader killed your father’ thing. The backstory should have been that it was Owen who had insisted on Luke being raised on Tatooine (Luke’s being supposedly ‘hidden’ there makes no sense) and retaining his brother’s surname. Then it would stand to reason that Obi Wan would retire nearby in order to keep an eye on Luke in the event that Vader might attempt to claim his son.