I feel this is a quality of life boost. There are so many invocations that are fairly niche, or that you think you would use but you haven't. I took Misty Visionsa while back on my Feylock, and never used it once. So, when we hit level 9 and I had more access to things, I decided to drop it for something we have been needing every single session instead.

Am I more powerful? Yes, but only because I no longer have a dead ability. It doesn't really raise the overall power of the class at all, just lets you evolve your character faster into their new concepts.