I mean, the whole thing used to be you initiate and with that you got a power and an attribute boost.
Then they broke it up to where you could do the two separately, which actually increases the total cost. However, you still had your power capped by the Magic rating. You always had to grow your Magic rating to get the new power point. It was on par with casters/conjurers. I don't recall seeing that optional ability in earlier editions to buy an extra power point, but its been years. Was it in 4e Grimoire or something?
Regardless, If you take that cap away, now adepts get to just initiate, and skip the Magic cost. They get a far greater boost that way, or so it seems to me.
I guess I don't see it a resource parity issue either. Where a Street Sam needs money, an Adept needs Karma. With the trade off during downtime mechanic, the Adept should be able to swap nuyen for karma well enough to catch up.
Feel free to Change My Mind. I lack some context.