Yoshi P talks about Warriors- from Producer Letter Live @ TGS

[CurlyBruce]

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It's not the same. Increasing your damage sacrifices increasing your max HP. (Speccing STR instead of VIT, STR Accessories etc.) Increasing your damage does not reduce the total %HP loss you take from boss attacks it only increase the %HP you heal from self heals. Example you are VIT stacking and have 5k HP and bosses hit you for 1k. You take 20% HP per hit. Your Inner Beast does 900 for 18% of your max HP. Now you change and start stacking STR. Your HP is now 4k and bosses still hit you for 25% of your max HP. Your inner beast now heals for 1000 for 25% of max HP. You increased your %HP return but also increased your %HP damage recieved. You are now also more vulnerable to large "1-shot" type moves because you sacrificed HP for more sustain.

If our self heals scaled based on max HP you could simultaneously increase your sustain while decreasing the % of HP damage you receive. Would actually give Thrill of Battle some utility besides just a snap heal. With Thrill of battles HP buff up your other self heals would increase as well. Would be like our own Convalescence.