Right, that’s what I’m trying to get at but for some reason it was hard for me to articulate. I think making the line a more generalized statement about himself like this serves the scene better than to say that the only reason he was on Ahch-To at all was because of fear. That’s exactly what Rian was trying to avoid since it makes Luke into a coward.
EDIT: Especially in combination with the new flashback voiceover where it’s revealed Leia’s greatest fear is hatred and giving in to that, this should work well. Each character has their greatest fear discussed Leia - hatred Luke - failure Rey - herself.