I would just add that I don't think it's all necessarily about ways he wants or expects to be remembered. Moments of it feel to me more like fear, either of failing to actually live up to the hopes he's expressing in the song, or just of not being enough. Maybe he would like to be remembered for more than just his sturdy arms, but he's not sure if he's been more. "Will you say when I'm gone..." is phrased in a way that leaves it ambiguous. The future is not certain, his understanding of her heart is incomplete. He wonders if she sees the relationship the same way he does, and what will stand out to her in decades to come, and whether it's the same as what he's tried to be and to communicate.
I would just add that I don't think it's all necessarily about ways he wants or expects to be remembered. Moments of it feel to me more like fear, either of failing to actually live up to the hopes he's expressing in the song, or just of not being enough. Maybe he would like to be remembered for more than just his sturdy arms, but he's not sure if he's been more. "Will you say when I'm gone..." is phrased in a way that leaves it ambiguous. The future is not certain, his understanding of her heart is incomplete. He wonders if she sees the relationship the same way he does, and what will stand out to her in decades to come, and whether it's the same as what he's tried to be and to communicate.