I like EK as a "War" type caster and Evocation fits well. It's pretty awesome to wipe out minions with a Fireball, and then take down their boss with a Greatsword. The game should not steer you away from Evocation spells after making them a core part of the class.
I think requiring and rewarding a higher Intelligence for an Arcane spellcaster hybrid class should be a thing.
I think Intelligence should affect the potency of all spells, not just offensive spells.
I think it's clear that EK is meant to be a hybrid warrior-spellcaster who uses both offensive and defensive combat spells, but lacks the utility/CC repertoire or versatility of a dedicated spellcaster. They can still pick any spell at certain levels and an 8th level EK can do stuff like Hold Person > GWM crits combo. So Intelligence can and should be a big deal with this subclass. Which leads us back to the Headband/Int dump being pretty stupid in a video game.
These kinds of hybrid classes tend to weaken the class overall, but I get the RP value of it. For what you sacrifice you don't get an equivalent level of power and you end up with a weaker class overall.
I was going to say a Githyanki Battle Mage would make more sense with high str and int - you never get the multi-attack options of warriors, but you do get all the wizard power and a strong melee attack if you run out of spells, plus the high AC and crit protection of a proper metal helmet.
BUT - looking over the EK it has some cool shit. Transposition, can't be disarmed, War Magic. Eldritch Strike basically makes you a demon killer since the higher ups all have spell resistance - although would be better if it was disadvantage against ANY spell.
Fighter sublasses have a lot of weight because the base fighter is kind of - well - basic.
