v.93, Big Bang Update Notes

They should reset all the AP and SP back to the minimum for your 1st Job class and let you rework the skills and stats for the new system. Resetting only skills that were removed or reduced is plain stupid.

It's not that stupid.
The vast majority of maplers have no idea what the new skills are or what their new build should be like.
Leaving unchanged skills alone allows them to continue playing, in some sense, the way they are used to, until they get it figured out and assign the freed-up SP.

However, some jobs do need a global reset, or at least a couple dozen free single resets, to get points out of less-useful skills that still exist.