No More Classes?

[Bishop81]

I like the idea that leveling one thing could potentially help something else.

This isn't very scalable though. As more and more cross-skills are add, the possible "configurations" of each PC increases and balancing becomes harder.

If you want balance then customizability of PCs, variety of weapon/spell effects and other novel ideas are often casualties - sacrificed at the altar of balance.

Not really should it's worth the sacrifice IMHO.