How?
I think there will be a bigger, more noticeable difference between two people with different perks than two people with different amount of strength.
Well Orc and Bosmer of same level and same skills an perks will do the same damage?
Adding more static attributes thats grown slowly will fix thats, since attributes can be tied to mechanic of perks, so if weak Bosmer thats has the same skills and perks thats have Orcimer will use armor ignoring damage with mace then Orc will actually do more damage because of his higher Strength attribute, what can be involved in work of armor ignoring perk for maces, why all try to replace some feature with perks and skills, while such feature can work together with both perks and skills in synergy not in parallel in awesome way?
Hit the sprint button.
With that you can obviously run faster and jumps would be longer cause of speed behind them.
BUT, it won't be unrealistic with you jumping 12 feet in the air.
Thats not earth so you cant apply realism completely and ignore mystical forces, did you see somewhere person who can jump on water?
Open DnD 3.5 epic level handbook, and you can found even more fabulous work of epic skills, if some one jump on 12 feet in fantasy he is not ordinary person.
I feel this is a MUCH better system, the acrobatics and athletics attributes weren't that well done, people just jumped around the world like bunnies and when you leveled up far enough you always run like you were on crack and jumped TOO high and long and in slow-mo at that.
For first Acrobatics and Athletics was skills not attributes, speed and agility was attributes, for second how you describe jump height for acrobatic Khajiit and bulky Orcimer if both have large fatigue? How you describe athletic Argonian and Nord who both has large fatigue? They all will move at the same speed and jump at the same height since there is no Acrobatics and Athletics skills and speed attribute?
Perks will take care of all other attributes and will be MUCH more fun cause they will actually do cool stuff and useful too.
You get to pick a perk at each level-up..
And what skill will govern running and jumping then?
Making an body skills thats has merged Acrobatics and Athletics, hand to hand, unarmored, skills and will represent Speed and Strength attributes as well as add new features via perks will be logical step does not?
People think they removed stuff when in fact they have more since they now not only have magic but also dragonshout magic, they also have a TON of perks.
You will be able to create so many variations of your character than before.
We have predefined magic thats limited to 85 spells, many spell effects was axed, TON of perks is only 15 perks on all skills including leveled ones and thous 15 perks must represent races traits, attribute work, add weapon specialization, add new features to game and more, doesn't thats too small number for all of thats?
Perk system must be really wide to work as actual replace of previous features.