1 hour ago, Roland said:
It’s still mostly random. You will get a boost to the magazine and parts for the matching perk you took but it is not an overwhelming boost. Your results will still vary but you shouldn’t ever find yourself in a playthrough where you never find those things.
The current implementation doesn't fit those criteria. I never found a magazine for some of the skills I didn't spec into (like armors, guns skills), but I did found a lot for a few (like food, traps and seed stuff - I found a lot of those, not putting points into related skills). In my current play I found very rarely any vehicle magazine till I put 3rd point into it. So based on that (and numerous other comments here and on reddit) it seems that current implementation biases some of the magazine probability a lot, while some are just frequent no matter what you do.