Like others I would have liked to see respec to be more expensive at least in tactician mode. On higher levels it's basically for free now. I too think a fee depending on the character level could have worked nicely.
I love the feature as such, you can save, try and play around with different builds and decide what works best. Also reinventing your character at a certain point seems fair, Withers has certainly the power to do so. But like for others, for me too it would be more meaningful and, yes, more fun if this powerful feature came at a higher cost.
Anyway, as people have embraced respec as a regular game mechanic by now, it can't be simply changed anymore. So I hope for more fine-grained difficulty settings / modes in the future that offer respec for a significant cost.
On tactician, it makes sense for respec to cost at least as much as restoring your oath.
