Ok, Swim is useless, for the same reason Climb is. I should have put this with that. Go back and read climb for my thoughts on swim.
Survival is a bit more interesting, because it has actual function uses, but it is totally pointless to put any points into the skill relatively quickly, making it more like a class feature.
What can you do with Survival and which of these are useful?
You can use to to both move and not starve to death at the same time. Pointless as hell!
You can improve your ability to resist severe weather like Heavy winds and Blizzards and Thunderstorms. Useless!
You can avoid getting lost and navigate around natural hazards. Of some utility for hexcrawls!
You can predict the weather! How is this useful enough in a role playing context to be a skill?
You can track! Totally functional!
Let's call the Survival skill the Tracking skill!
Current Analysis
A lot of these skills have been around a long time - tracking since 1e. So obviously there is some ground here for use. The problem is, excepting tracking, all of these "Skill functions" are really "abilities". You are either able to intuit direction or you cannot. Also, player skill can be used for this instead of a character skill. Weather prediction is so rarely useful that being able to predict the weather with any certainty is pointless.
Fortunately due to the ways skills work, these functions basically become automatic at the expenditure of 1 skill point. Tracking though, works, i think, just like it should. However it has the same problem tracking always did - the ease in the campaign that someone can overcome or supersede it with magic.
Conclusions & Suggestions:
I remember all these skills from second edition there, and they were for flavor. Simply letting someone do these things is such a non-issue that it seems strange anyone willing to spend 1 point on a class skill can do them trivially.
I'm fairly certain tracking works as it always has. Although, you might be able to come up with a fairly simple mini-game to replace the skill that might be cool.
