I think a good in universe explanation for a lot of small plot holes in Luffys backstory is that he was kinda sickly when he was born and everyone was just glad he was alive.
Why was Luffy raised in foosha village and not with the mountain bandits like Ace? He needed more care than was possible at that mountain base.
Why is Luffy so much smaller than his dad and grandpa? Because he was born sickly and nearly died every time he went out without supervision till he was at least 8
Why did Luffy not know haki? At 7 Ace was fighting grown men and winning with mild scratches at 7 Luffy with a devil fruit that makes him immune to blunt damage nearly died do to some random bandit the moment he did not have direct supervision. They needed to work on basic not dying in a fight.
Why was Garp in the east blue at the start of the series with a conveniently open position that would train a teenager in haki and marine skills? He was planning on filling that position with Luffy and teaching him ship and haki stuff than.
Why was Luffy so much weaker than Ace when he set out to be a pirate? His training and actually fighting didn't start until later in Luffys life than Ace so he didn't reach Ace at 17 levels till he was like 19
Why wasn't Luffy taught so many things about this world? People were just glad that he wasn't dead because he nearly died like 4 times by 8.
Was this planned by Oda probably not but it fits
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