Even producing headcanon for a 12 year-old random answer from Oda, great.
"Brakes on him with obstacles," is nicely vague, and you're just assuming it means "nerfing him". Instead of, you know, putting opponents in his path that he can't beat easily, or giving him severe drawbacks to his lucky godpower, or putting others in danger around him that he gets distracted by, etc.
Congrats to Oda for not writing his character to instantly defeat every arc's villain. This means that Luffy is nerfed, or something...