Your arguments all apply equally to Oblivion and Morrowind, which ultimately have just as much/little character customization. We aren't all picking the same perks any more than everyone picks the same Major Skills, Birthsigns, and Race in Oblivion.
Actually, if you looked at Oblivion, you could believe that everyone makes a Breton (Best Race) Atronach (Best Birthsign) with whatever 7 skills were decided to be best for "efficient leveling" as their main skills. And we all know that's not true.
You could say something similar about Morrowind too.
All perks are potentially useful to me. I've only had time to create two characters, both the same race and specialization (Combat), but the similarities end there:
Ones' a two-handed swordswoman and archer that uses light armor, and dedicates both hands to all tasks.
The other's a heavily-armored Sword-and-board juggernaut that switches between swords, axes, spells, claws, and shields.
My siblings also play completely different characters:
One plays a redguard that keeps a fire spell in one hand and sword in the other.
The other plays a light-armored assassin.
In both Oblivion and Morrowind all characters could do everything, at the lower levels in Oblivion, and higher levels in Morrowind. It's what the TES skill system is based on.
