You can take it both ways - I think that an aeroplane like, say, a Chipmunk or Cub that puts a lot of handling demands on the pilot but not much in the way of systems management has a lot going for it. That's why I said above that I consider the C150 and PA38 to be much better trainers than Warrior.
On the other hand, the military have put ab-initio students straight into jets in some countries for years, and those of us who started on the Bulldog weren't getting into a simple low powered aeroplane either. That's not noted for its failure to produce good pilots.
But I do think that a very undemanding aeroplane like the Warrior, combined with relate simplicity of systems may well be the worst of both worlds. At least by adding in a few systems (and in an ideal world something like a GNS430 as well) you're helping the student build capacity as a pilot early.
G