Beyond a certain capacity the bladder is no longer contractile and must be catheterized to urinate. Happens every day in the OR or PACU.
If we were intelligently designed, after all, I think God would call holding it for hours a "user error" and mark it "won't fix".
So just to confirm, you're saying that if (for example) I hold my pee for whatever reason, after a certain point, I might not be able to pee unless they catheterize my bladder?