[RogerBW]

It is an eternal problem of GURPS that things "should" be worth different amounts based on their utility in different settings. Unusual Background is the main tool we have for this.

In my entirely imaginary new edition of GURPS, everything that adds to attributes sometimes would be a variant of the same advantage: increased attribute, with a accessibility limitation based on how common the situation is, and a bunch of worked examples. Yes, points can be a bit of a blunt instrument for this when you get down into the fine detail, but that may mean that a mere +1 isn't significant enough to be worth recording and you might as well buy a +3 (i.e. like Resistant).