People will have different experiences depending on their gaming group.
One group may find a particular stunt or power overpowered/underpriced or both. Some groups may not abuse having a consequence track per type of damage, some would.
I think this game always needs house ruled to fit a particular gaming group. What works with one group, I can say with almost complete certainty, will not work with another.
That said, I find the stunts and powers used to increase durability to mitigate the issue of having only one consequence track works well...generally. I also feel that having multiple tracks may lead to spellcasters with a lot more oomph for better or worse.