Arcane Grimoire +1/+2/+3 increases spell save DCs, if that's what you are asking about.
Or unless there is an enemy with a ranged attack. Or unless an enemy charges them from a different direction. Or unless the fighter is out of position.
Trust me, I know EXACTLY what they are capable of. Had a DM weep for joy the single time he hit the bladesinger in our group. Over the course of the entire campaign, the guy was hit a single time.
And the problem is, an okay caster is still incredibly powerful, and you only NEED to be "okay" at martial things to be just about as good as a martial.
And if you want to compare nova between a caster and a martial, you are going to be very very sad for martials.
Parry isn't a feat, do you mean Defensive Duelist?
Also, Elven Accuracy is fun, it allows for increases on rolls that use dexterity.... and intelligence, wisdom or charisma. Who do you think makes more attacks using intelligence and charisma? Martials or spellcasters?
Following up, note how you used Polearm master twice? It is one of the ONLY feats in the game that has combos, and it ONLY works with polearms, and what is the thing I was literally told this month about magical polearms? "Well, if you want magic weapons, you shouldn't have specialized. Everyone knows that magical swords are far more common than magical polearms, that's the point." Kind of weird that the single most powerful melee choice is to have one of three identical weapons, and then you end up risking not getting magical items from specializing too much.
One of the more recent One DnD interviews. Probably this one?