i have a really bad feeling about this. everytime you have added cooldown to something that didnt have it previously it was a severe nerf.
see telos boltace slide attack cooldown made the weapon worthless. (i get why it was needed, but just an example). or blink cooldown as another example.
i dont know how high you plan to make the cooldown on arcanes, but the past has showed us you really like to spice up that number so im calling it already: rip energize. have fun doing SO/O or even sorties solo/public with frames whose dps relies on spaming their abilities without a trinity.
but beside that there seems to be a lot of nice QoL changes coming and its always nice to see that a developer listens to its community to improve the game.