I asked that same question of a man with a PhD in materials science (or something like that). He said to me, "would you ever pull this boat up on a sandy beach?" Indeed I would says I, and he says, "buy aluminum."
That was three boats ago, all aluminum of course. The second one I bought new in 1998, and sold it this spring for 75% of what I paid for it 24 years ago. And even though I did beach it, and bumped into the odd rock and the odd stump, etc, it was still water-tight, no leaks.
BTW most of my fishing is like the OP.
Doug