When you say defensive skill, ill just assume you mean Evasion Shield Parry and Guarding skill. Evasion itself is easy to cap, so I highly doubt ppl really have that underlvled (and if they are underlvled, then the fact that thier not dodgeing attacks because of the lack of skill is killing them already). Shield skill only really applies to Plds, and since they are already tanks, they will probably be capping that easily as well. And as for Parrying and Guard, there base proc rate is so low on mobs that matter that if SE took it out of the game, not that many ppl would notice the difference.