It would be nice to have but I don't have issues with the current system. I'm nowhere near having all my low level characters leveled to the point of having issues finding a ton to use for a craft.
But I can see this as an issue whales might have. (Though if you are spending money to gear crap characters, that's another issue entirely). But CG would not like to discourage this. And I can see where this could be needed if they ever ease the gear crunch below g12.
If gearing to g11 is ever easy, then there is benefit to gear everything that high to bloat gp for tb but still keep them below your top 80 teams for gac.