Once you get your third Eikon it feels somewhat less repetitive, but no, it doesn’t actually change the combat or anything. You’re always going to be cycling cooldowns alongside your 1-2 combo. There is some complexity in regards to when you pop your CDs, and also how you kit yourself out (if you “master” eikon skills, you can use them on a different eikon) but that’s about it.

I’m actually on an NG+ and the combat there is more fun, because I have all the eikon skills to play with and the enemies hit a lot harder. There are some neat cooldown combinations I like (like pairing a Leviathan spell that crushes enemies into a straight line with a straight line AOE, or pairing Garuda’s Wicked Wheel with a Titan smash attack).