Jau
I'd agree that Warriors are not the ideal trainer - they are too docile to learn about some aspects of handling that may become important when or if you move on to more challenging types later.
But Warriors do make a brilliant low hours tourer because of this aspect, so if it were me, I learn on the Tomahawk to at least ex12/13 and if you want to convert to the Warrior for x-country, it could make sense.