I actually wanted to see if every stat choices were able to get a perfect ending, and so as you say, only half of them are able to. But all of them can at least get an acceptable run (which is 0 or 1 bad end in total, a corrupted run is 2+ bad end). So in the game there's no distinction between a perfect run and a run with 1 bad end so technically, every stat choice can get you the best ending possible. But even with that I can agree with you that not being able to always do a perfect run is quite frustrating ;)
Also, only one stat choice is able to perfect the market route : speed/willpower, and it's just because of the shipping area. There are two single checks and if you happen to not have both of those stats, boom bad end.
And yeah, I also think that "The Sluttiest Tool in the Box" is too counterintuitive to get. I couldn't get it without looking at the comments
With all that, thanks for reading and analysing my guide, I really appreciate it ;)