Because obviously creating skills for a skeleton may be very different than for a zombie.
Well, thanks. Now, thanks to you... I imagine a zombie vs. plant fight, D:OS style.
Better much those sunflowers fast.
And personally I just vote sticking it to the boni, rather than making a very contrived system, which then is further hampered by the extended balance during during Alpha/Beta, just like with D:OS. It's setting yourself up for a boatload of work, and many many problems could arise from it. And then if you dump it, all that manpower that went into it is just gone.
I do want to see the poison = heal / healing = pain from D:OS return for undead (rather than an upgrade for all it was there).