In my opinion, starving them for attributes makes them tagalong party buffers, more than individual characters. They'll float along with everyone else and use Conceal, Guard, etc, etc, to make the rest of a Shadowrunning crew pretty badass, but they'll be too short on attributes and skills to be much more than that.
Giving them all their attributes as they increase Force, on the other hand, makes them certainly more independently viable as stand-alone characters, by which I mean they're suddenly good for quite a bit more than just being the, I dunno, party Bard/buff...they'll have saved enough points to have reasonable skills, and with great attributes across the board they'll be able to cast and soak Drain well enough they'll be a solid direct-damage addition to a group, not just a buffer.
But they'll get it for pretty danged cheap, and can certainly imbalance a game that way (going with my gut).
So take your pick. One way kind of screws the Free Spirit but helps a group of Shadowrunners, the other way makes it a little more fun/active for the Free Spirit PC, but perhaps at the expense of the party balance.