The hotpatch does help with a lingering issue with progression, though.
I find it a bit distasteful that (in the hotpatch) MsyAds don't get a power point per magic increase and *have* to rely on metamagics.
Honestly, if 5 karma is equal to a power point during character creation, then it should be equal to one after character creation too - so maybe it costs that 5 more karma to get the power point when you increase magic. Not getting it altogether makes the Mystic adept not really a blend of the two character types and forces a definite choice in one direction or another.
I think what what I learned about game balance in 3.5 D&D with Mystic Theurges (Wizard/Cleric hybrid Prestige class), is that 2/3 the power of both classes is still underpowered. I think the Mystic Adept in SR5 is more than 2/3 the power of a Caster and more than 2/3 the power of an adept, and that's *good* for game balance. A half/half split didn't work (see SR4), so something better than that was needed.
I think that 5 karma is pretty good for balance; I'd like to see them extend that to post creation as well.