Yes, that does make things difficult for you. So did you play TW2 and if so, was it one of your exceptions? Given that you miss out almost half the game if you only play once?
I'm the opposite. I don't rush through the first playthrough, but I also don't go out of my way to find things that I may have missed. And I want multiple playthroughs - first is trying it out, second is canon, third is completionist.
I have actually never played TW2... I did play a bit of TW1, but only some... I don't know, do not really remember since it was 6 almost 7 years ago I played it... so maybe some 20-30 hours into the game... but I never finished it. Although... I don't really feel that I can say I "played it" with only 20-30 hours into a game like that... 20-30 hours for a game like that is just a "minor test" for me... :stuart:
Then some other game probably came around that I felt I just had to play, and sort of forgot about TW1... and then at some point, I am guessing, I got to a point where I probably needed room for tv-series or something, so TW1 got deleted to make room probably... and then it never got reinstalled. Of course I always intended to go back to it, and I also intended to get to TW2 as well. It just never happend. I did like TW1 though, so it was not due to quality or any kind of dislike that I stopped. It just ended up being one of those games that like a lot of other games just accidentally fell of the wagon and got forgoten.
But... if I where to take a guess... if TW2 needed more then 1 playthrough to see everything in it... then yes... I would most likely never have seen all the extra stuff if I had finished it in my first playthrough. There are games in my top 10 best games of all times, that I have only played one time. That's how much this quirk can effect me. Certain types of games however lends them selves very well to me returning to them, even if I did finish them or not.
Take the Mass Effect games for exampl (some of the few games I have actually finished in the last 10-15 years), even if the outcome or stuff you never saw due to you did X instead is probably not as diverse as maybe TW2 (I have no idea how big the difference might be)... and even if I have played ME1 three times, ME 2 two times, and ME3 one time (I really had a strong need of playing the previous games again when a new one came out)... I never saw any of the gameplay, or story, of that game outside of playing as a soldier, and always doing the "good thing" in all the options. The two times I replayed ME1, and the one time I replayed ME2, I still played them basicly exacly the same way as I had the first time I played them... as a Soldier with assault rifle as main weapon, and always doing the right and/or "good" things in the game.
Same with games like Fallout really... or most games in general... I play them a certain way, and I rarely try other playstyles because they rarely, if ever, interest me. For example, playing as a mage in a game is one of the most boring thing I can think of, so as such I would avoid playing a mage type of character like the plague... which is partly why I have never found it interesting to play something like a force user in Star Wars games, or the Biotic classes in Mass Effect. XD
So yeah... as a first playthrough, I in general prefer to play the types of jobs/professions/etc that I like, with the equipment I like, in the way that I like, and in general doing everything possible to miss as little as possible... in that one single playthrough... because as said befor, chances are I might never return to it... no matter how different the game would be if I played something else or in a different way.
A strange thing is that even if things are the same with me with tv-series and movies, where I almost never rewatch a tv-series, and only a few movies get rewatched on rare occations... things are compleatly different with books... books I like I can re-read almost any number of times. If I am counting correctly I have re-read David Eddings book series "The Belgariad" somewhere around 8-9 times, with The Mallorean one time less, Belgaraths book 1 time less then that, and Polgaras book one time less then that. Probably read his series The Elenium and Tamuli about 5-6 times. and right now I am on my 4th read-through of Katherin Kerr's The Devery Cycle series, read Robert Jordans Wheel of time 2 times (due to how long it is, otherwise it would have been more often, I am actually due a 3rd time now with the last 3 books finally being out)...