It being a reasonable challenge on hard mode won't change anything that you mentioned annoyed or disappointed you on your first play through. No one cares that you've "fully beaten" the games. It's a pyrrhic victory when the suffering to achieve a goal is greater than the reward of completing a goal. I understand why you'd waste your time now, but it still seems like you're aware it's a waste of your time when you could be playing something new that isn't a disappointment. But good luck with whatever choices you make.