what i think BGS is in the constellations of the game, the mage, warrior, and thief, those constellations contain specific skills in them, maybe once you increase enough skills in the said constellation it gives you constellation bonuses that upgrades things like speed, or maybe constellation specific perks, yes when you look to the stars the 18 skills are in three constellations, mage, thief, and warrior.
so say my character increases and puts his perks in the skills of the warrior constellation, maybe once i put enough in there I unlock and constellation perk that increases damage with all melee weapons, or increases my carrying capacity. this way the the old attributes are there to define a character but tehere in the as a way specific to the constellation your better skills are in,constellation perks unlock once you put so many perks in the skills of that constellation, you can get perks in all constellations but if you spread them out you wont be able to get all the perks in a specific constellation.
now some of you just to argue with me will say but all our skills will be 100 at sometime, possibly but you cannot get all the perks of the game and so you cannot get all the constellation perks,soo really constellation unlockable perks would solve everyone's bitterness,
Now here are some constellation upgrades
mage= increase magica regen, more powerful spells, spells duration lasts longer,
warrior= more damage for melee weapon, be able to carry more, more damage resistance.
theif= ranged weapons damage increase, movement speed increased, jump higher,
truly most of the attributes in OB where usless, the only ones that where useful was speed, wilpower, intellegence, strength,and endurance anyways.