I can tell you why , a reason they wont fess up to but its absolutely true
They want to broaden the appeal of the TES games, so they dumbed them down to appeal to the action fans
Just like what happened to ME2
Just like what happened to DA2
RPG focused companies keep staring at the 100s of millions coming from COD and really want a slice of that pie
And thus was born the streamlined and rpg lite TES
Lol you get around don't you? You were somewhere else spouting the same stuff.
It has nothing to do with dumbing it down or appealing to action fans.
Take off the tin foil hat for a second and think about it.
Every stat boiled down to Health, stamina or magic in the first place. So there is no point in convoluting this with a slew of stats that are all different sides of the same coin.
Whenever anyone levels up anywhere they basically ask themselves the same thing: health, stamina, or magic?
That's it. For example I never once placed a point in personality or luck.
Lets look at the others.
Endurance and strength were basically two sides of the same coin of health. Strength was redundant though since it raised your melee weapon damage but so did your skill with the weapon anyways.
Int, and Will were just oposite sides of magic. Noone just raised willpower.
Speed and agility were pretty similar to endurance and strength except for stamina/running speed.
But what is quit possibly the biggest flaw in your arguement is that when considering perks and all available combat options, skills, and attributes this is far, FAR MORE complicated.
Leveling is also far more exciting and worth it now.
Hell in Fallout you didnt even upgrade your attributes at ALL and you are over here claiming its all dumbed down. You could upgrade your attributes only if you took the perk.
They've only added things to the leveling process and made it more complicated if anything.
They just removed useless skills and attributes that everyone complained about anyways, then when they do (which I THANK you for bethesda, they were literally pointless) people come in here and say its dumbed down. Tsk Tsk.