Skills cost a % of your total health, increasing your health pool will just make them cost more. The tradeoff for a higher level of skill is more damage at greater cost, as with any RPG out there pretty much.

That's why we have feed.

And in PvP it just means you need to use skills more thoughtfully.

I think it's a rarely-used and exciting mechanic that, along with the ability to charge skills and attacks, makes for intetesting combat.