i can't add points into HP, why?

Adding to this question, was that limit at level 20 added at the same time the text "If you do this, you may have insufficient stats to become as strong as you could be"? I just noticed that text on a warrior of mine and found it kind of amusing.

I'd assume they were added together. It is an ironic message, since you can't boss as a ranged class ever without washing or going for a Blood Build.