I never understood people that watch complete gameplays of some games. I mean, I respect it, some people enjoy it or do it because they don't have the economic resources to play them (I think it applies more to modern gaming), but like I said, I've never understood that action. For example, i'm 27 rn, and when I was 24, I completed for the first time in my life ocarina of time on a real nintendo 64. I wanted to play that game since I was a child and, actually, I've played it a ton of times, but never went far of jabu jabu, because I didn't want to emulate it nor play the 3ds remake, I wanted to play it specifically on a nintendo 64, but I still never watched anything about the final battle and all of that, and man, I didn't know that ganon had a 2nd form (yeah, I know, I live under a rock), and I thought I was already finishing the game when the battle started! that battle, with that epic song on the background, the zelda screams, all was AMAZING to see for the first time in my life. It will remain on my head forever as one of my most fond gaming memories. Another epic moment was when I reached the temple of the forst and all the atmosphere became so creepy with the song and the place.
My point with this is that there's a ton of games that I still wanted to play as a child, and I still want to, but I still won't see any full gameplay because I think that the magic of all of this is living all the experience by myself without knowing anything (or a little bit just for awaking some interest) :)
I still approve watching some endings on youtube in case I completed it, depending on the game lol