I don't know, it just seems like a bizarre attitude to me. You could beat the boss with help in the time it would take to watch a Youtube video of someone else beating it and then move on with your life. Perhaps neither is a "satisfying" option, but I see no reason why you'd pick the Youtube one over seeing your character do it instead. If the challenge or experience of beating bosses isn't something that's important to you anyway, you're not really spoiling anything for yourself. You say that you have no motivation to do it, yet you clearly want to see the ending or you'd have just abandoned the game altogether and wouldn't be worried about watching the ending on Youtube. An ending which, given there are four of them, may not even correspond to the choices you made.
But hey, do whatever makes you happy.