No. Not regression.
Reverse Progression. It's a bad name for what I'm suggesting but it's clickbait and I thank you for your attention.
What if you got your best powers first, and then fill out with less powerful ones as you went along, instead of grinding away to get the best powers to eventually get an idea of whether or not you'll enjoy the class at higher level?
You get to know if you love the character almost straight away. No grinding. Big, impactful gameplay that draws you in and then holds on to you as you fill out your arsenal with less and less impactful, but still important and varied powers.
You won't play the character beyond the first few levels to know if you love it or not. Some will see this as a CON, I don't understand why.
The devs would have work to do on this.
There may be issues with the super-crap powers that you currently get at the start of the game - people would probably pick pool powers instead (which ISN'T in itself a bad thing). This may provide scope for improving those powers in some way, perhaps making them do different things.