Justin D. Jacobson said:
Assuming by "better" you mean "more likely to see use", let me illustrate with a counterexample of a type of campaign where your absolute is false. Let's say we have a campaign the focus of which is solving the assassination of the king by poisoning. The entire campaign could involve tracking down clues, experimenting to isolate toxicants and reagents, etc. There might not be a single combat until the BBEG is finally identified (and even then, he could just be Mr. Burns

). In such a campaign, the Combat skill would see far less use than many Knowledge (and similar) skills.
Doesn't prove anything. The only way you didn't use the combat skill was by
not having any combat at all. On the other hand, did every encounter that used a knowledge skill use
all of the knowledge skills? Not without a lot of careful planning on the part of the DM, and possibly even not then.
Now do you see what I mean when I say better? When the relative situations come up, irregardless of how often they occur, it is guaranteed that combat skill will be used in all combat encounters while it is not guaranteed that Knowledge (the planes) (as an example) will be used in
all knowledge encounters. This means that combat skill is a better skill than knowledge (the planes), mechanically. It may be less useful due to the circumstances of the campaign but the underlying game mechanics make it an inherently better skill.
GMs should tailor their campaigns to what the players focus on.
Relevance?
Take the ranger's favored enemy bonus; a GM who never presents encounters where the favored enemy appears is doing his players a disservice. Similarly, if a player invests in Knowledge (architecture), the GM would be well advised to include encounters in which a Knowledge (architecture) check would be helpful. If none of the players have ranks in Knowledge (religion), the GM isn't doing the best job possible by constantly calling for Knowledge (religion) checks. All Knowledge skills don't need to be used with equanimity--only the ones in which the players invest ranks.
So, now you're arguing in support of my statement. I'm glad you finally agree with me, though I'm confused why you didn't edit the beginning of your post to reflect your new position.
I wasn't saying that Knowledge skills are the same as Combat. They can be in certain types of campaigns (or, indeed, can even be more relevant). It did seem like you didn't like the level of granularity of the Knowledge skills. If I inferred that incorrectly, I apologize. There's a simple fix for that to. Namely, to decrease the granularity, e.g., Knowledge (hard sciences), Knowledge (humanities), etc.
No, you miss the point. Because knowledge skills are very granular (as are athletic skills, larcenous skills, stealth skills, social skills, perception skills and all the others) they are mechanically weaker than the non-granular combat skill.
Try this explanation. If you had the choice between Knowledge (horses) and Knowledge (nature), which would be a mechanically better skill? Which is more likely to be used in any given knowledge encounter?
Now, if you had the choice between Knowledge (nature) and Knowledge, which would be a mechanically better skill?
Now if you had the choice between Knowledge (nature) and Larceny, which would be a mechanically better skill?
Now, compare Knowledge (nature) and Combat. Which is the mechanically better skill?
Sure, campaign can change the equation. There's no point investing in a skill if it never gets used (except to add flavor to the character). That doesn't alter the underlying mechanics of the game.
Odd, the Favored Enemy example seemed to indicate that you understood and agreed with this. Confusing.
You seem to think I've escalated the heat of the discourse. If prior reply to you seems aggressive or rude, I fault the Internet. It certainly wasn't my intention.
Wait, there's heat?
No sir, I think you're misunderstanding my posts because you're inferring things that aren't being said. You're drawing conclusions when there are no conclusions to draw. Everything I want to say, and everything I mean, is already posted to this thread. You seem to be misreading it, adding contexts, words, clauses, meanings and phrases that aren't there, resulting in me having to repeat myself again and again. I get tired of that sort of thing, so I hope that you will stop mentally editing my posts and instead read them literally; my expectation is that a literal reading will make it abundantly clear exactly what I mean and then we can progress to an actual discussion rather than a repetition of our respective starting logic.