To be an efficient warrior, and lets say we SKIP block.
You still need one handed or two handed, you must take smithing, you should take enchanting, you must take restoration to survive you must put skill points into armor.
If you add someone wanting to use a shield from time and again.
Its literally 5 schools that you must take to be competative.: Weapon, Block, Restoration, Smithing, Armor. Add in Enchanting and Alchemy which is rather essential as a warrior too, and thats it.
A mage and player believing they can manage the game in 1 or 2 schools is a joke and us also not enjoying the game to its fulliest.
I say as a mage, there are 3 major schools that is must have: Conjuration, Destruction and Restoration. As a 4th I would say Alteration for better survival.
Add in a weapon and you suddenly have 5 schools, which is the bare minimum for a warrior.
This is simply not true, and moreover is completely missing the point of the discussion.
Firstly, a warrior needs two skills to be powerful enough to beat high-level enemies - a weapon skill, and an armour skill. That is all. Block is not a necessity (trust me, my character does not use it). Enchanting and Smithing are not necessities. You can find armour on enemies and in chests which is powerful enough to make your character viable. Alchemy is completely unnecessary unless you want to do the crafting exploit, which is in no way a requirement if you want to be powerful enough to tackle high-level enemies. Restoration is a luxury at best, seeing as potions are plentiful in chests and dungeons.
Secondly, in order to be powerful, a powerful mage can be made using only Conjuration, and possibly Alteration. A powerful mage CANNOT be made with just Destruction and Alteration, because Destruction's perked damage output is far worse than other direct-damage skills like 1-handed, 2-handed and Archery - and even worse than Conjuration, which is supposed to be a means of INDIRECT damage.
Thirdly, and
most importantly, no-one is arguing that a mage should be all-powerful after levelling up just Destruction. EVERYONE BAR NO-ONE realises that Destruction will never afford a mage any defensive capabilities. That is what skills like Alteration and Restoration are for. What we are arguing is that, as Destruction is a direct-damage skill, it should be powerful enough to compete with the other direct-damage skills, namely 1-handed, 2-handed and Archery. At the moment it is not, because the damage does not scale with the skill level. If you want to use Destruction as a primary skill, you
NEED another damage skill to help you deal enough damage. All of the other direct damage skills are strong enough to survive on their own merit.
And fundamentally, if Conjuration does more damage than Destruction, then what's the point in having the skill? The ONLY point in Destruction as a school of magic is to deal damage, and it's not even the best magic at doing that.