doesn't really argue against the situation where each race gets base stats + a certain amount of trains to allocate to stats.

eg. Fire giant gets base stats. Not rollable. Same for every fire giant. Then he has 10 trains to use on creation. Some might go for str, and some for other stuff.

I'd also consider tying in str to the hp equation and dex move heavily to the movement equation (and then making movement regen also a function of max moves).

That way it isn't obvious to practice con, wis, int first, and you would have a greater degree of heterogeneity.