Sure, people would be able to field Kroot Mercs that way. But as noted in the second set of rumors, GW wants army X to look like army X. Taking away the 1+ while keeping non-Tau troops allows for (*in their opinion*) armies that don't look inspiring or cohesive.
They've shown this philosophy as far back as 2nd edition, splitting Chaos into three lists (Marines, Cults, and Daemon World Armies). During 3rd they split Imperial Agents up into two codices, and more recently they again split Daemons off into their own codex. Now Tau may be getting the same treatment.



The Dude
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