Black Knight Irios
Explorer
Yeah my opinion is that Acrobatics and Athletics should be used interchangably, much like Intimidate and Diplomacy. The *situation* you use them in may be different, but the *results* are the same. Strength (Athletics) will get you up the slope more quickly and makes it easier to find purchase, but dexterity (Acrobatics) will help handle difficult surfaces and use purchases more effectively. Irregardless of which one you use, both will get you up the mountain.
It's a shame we lost the synergy bonus in the 3.5 to 4E transition, but ah well. I know many DMs will use Athletics to the exclusion of Acrobatics, much like many DMs use Diplomacy to the exclusion of Intimidate. I can't blame them when "climb" and "jump" are listed under the sole domain of Athletics in the RAW. I just try to not be one of "those guys" I guess.
How can you say that you can use them interchangeably by saying the results are the same when intimidate states that the target becomes hostile afterwards. This is not the same result. If you never care for the ensueing hostility and don't add consequences, you are right diplomacy and intimidate produce the same result.
If you think those skills do the same why do you have 4 skills instead of 2?