Why do people compare ONLY Destruction Skill (mage) vs Smithing skill, One Handed Weapon skill, Blocking skill, Heavy Armor skill, Enchanting skill (warrior)??
Mages get less perk points than all other archetypes out there or what??
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Mages TOO have skills with synergy.
One of the Alteration Magic perks is Mage armor. If you run without heavy or light leather (as you do if you use only robes) then oakflesh (40 armor), stoneflesh (60 armor), ironflesh (80 armor) etc get up to x3 as strong. Dragonhide let you ignore 80% of all physical damage for a short period of time. You block up to 30% of spell effects and absorb 30% magicka of spells that hit you (basically can't run out of magicka if you fight other mages). Feather let you carry lots of loot without spending points in stamina. [Mass] Paralyze for crowd control. Telekinesis let you steal stuff from range. Transmute for free gold.
Or maybe instead of Alteration + Robes go Enchanting + Heavy Armor and keep - or even improve - all of magic buffs you normally find on robes.
Illusion let the mage turn his opponents against eachother with frenzy. Not only does it damage your opponents (while you at the same time blast away with your destruction spells), it also act as crowd control and reduce incomming damage taken. Illusion also let you silent cast all magic. Invisibility let you "reset" a fight in a more powerful way than the top sneak perk. Muffle even let sneak around in heavy armor if you like to go that way.
Conjuration let you summon up bound weapons with inbuild soul traps. Eventually you can have two atronachs or reanimated zombies at the same time fighting for you, adding up damage done while you blast away with your destruction spells for range or aoe and your bound weapons for solo targets at melee range - they also soak damage for you.
Restoration let you regen magicka (and health and stamina) even faster. And you can buff magicka (and health and stamina) pools. Cure poison, disease and paralyzis effects. Heal health and stamina at the same time. You get a 250 point cheat death instant heal once per day. Cause undeads such as draugr, skeletons and vampires to flee in terror while you cast your destruction spells on their backs.
Destruction perks give your destruction spells a stagger effect (stun) and cool disintegrating finish moves (die from a spell if they are at low health). You can place magic trap runes quite far away and you get access to fire (which turn off troll regen, making trolls very easy to deal with), lightning (which arcs and bounce to close targets and seem to own undeads. It also drain magicka from other casters), frost (which drain stamina and snare, making it good against melee targets).
You can also get a lot of inspiration from the starting skills of each race. How about a dark elf mage assassin in muffled leather armor buffed against magic using alteration.... killing single targets with hit n run... i mean invisibility... poisoned backstabs, and silent casting frenzy + destructive magic against multiple opponents (Destruction, Alchemy, Alteration, Light Armor, Sneak, Illusion) or an imperial "pladin" with turn undead, powerful healing spells that also heal stamina, enchanted heavy armor and shield, one handed weapons for melee and destructive magic for range and elemental weak opponents (Restoration, Block, Destruction, Enchanting, Heavy Armor, One Handed Weapons). Why not a brenton necromancer fighting in robes. Using pots for buffs, poison and healing. Buffing up further with magic armor and different wards and healing health and stamina with restoration magic. Dealing damage with bound weapons, Frenzy and Zombies. Stealing items from range, skipping stamina but can still carry loot using feather and quickly regen stamina with restoration. Using both charm and speach to sell off all that loot and talk your way out of tricky situations (Conjuring, Alteration, Illusion, Restoration, Alchemy, Speech)