Athletics and acrobatics had it coming. Athletics was as useless a skill as Swimming was in Daggerfall. Acrobatics was meh also since you couldn't grab on to ledges plus you would end up jumping all over the place trying to spam level and it's just silly looking. There should be no reason to be disappointed with the removal of these skills or attributes because really it only comes down to "It was in a previous game" (usually Morrowind...) even if it wasn't particularly useful. Mediocre features in a game doesn't improve the game, it just brings the game closer to mediocrity. The mediocre things from before were melded into the game out of sight and replaced with features that actually noticeably impact the game and are useful. Mainly people need to be more open to change instead of holding on to the past or else the game will never move forward, which it seems it is moving forward just like it did with Oblivion. Oblivion was a step in the right direction though it was marred a bit with a few experimental features that didn't work out perfectly. Those have been remedied.
There's nothing mediocre about being fast or being able to jump high. You can make whole builds around it. Plus its been in since Arena, not Morrowind.
Thats not the reason, the reason is because everyone used it, it was force on you, it made no sense. You play the game you use the skills, automatically.
Not really, your the one that kept jumping, or raising your speed. If you didnt take either as a major, or specialize in them, it took dozens of hours to get athletics up high enough to be faster than you wanted to be. So you fix it, you dont cut it.