DRK the least chunkiest or is it just me?

[Satarn]

And how exactly do you know that all the fights in eden are magic based? Last time i checked there is no way to tell the difference between magical and physical damage. A boss could be swinging his weapon at you for a tank buster that looks physical, but the damage you take could be magical.

Aside from the fact that most people just check on fflogs(damage taken section has a list of all attacks which are color-coded for physical, magic and dots), you can also just look at the battle log in-game. There's 4 types of different log messages based on whether the attack is physical instant, physical cast, magical instant or magical cast:

EnemyName uses AttackName. - physical instant
EnemyName readies AttackName. - physical cast
EnemyName casts AttackName. - magical instant
EnemyName begins casting AttackName. - magical cast.

Would it be nice if there was some easier way to see it mid-combat, like colors or something? Yeah, totally. However saying there's no way to tell in-game is completely incorrect.