I think ideally we would split defensive abilities into several subcategories. Stuff like ice vision, positioning, self-loathing (leading to higher willingness to block shots), stick moves and such would be really nice to diversify defenseman and allow everyone granularity to their builds STHS doesn't even come close to dreaming about. Obviously I think these would have to get some sort of a collective defensive rating to make it a bit easier to read right away, and all 4 would be sort of sub-skills, so they would be easier to improve so one isn't stuck dumping TPE into stick moves forever and ever, but maybe trying to make it so you can't max out more than two of these and just have a little bit of an extra ability to differenciate between different defenseman in the league and see who does what, how he achieves it and what's the most succesful strategy that everyone copies almost instantly after it gets discovered. Oh well.