20th lvl abilities for rogue / ranger

[thugsb]

Ranger’s Master Hunter is DC 20+Ability, not DC 10+1/2lvl+Ability.
Rogue’s Master Strike is DC 20+Ability, not DC 10+1/2lvl+abil.
Yet a bard’s 20th level ability is listed as 10+1/2lvl+abil.

I know the max is 20th lvl, but there's no reason for it to not be written as 10+1/2lvl+abil, because that leaves it open for Epic play, and means there's one less rules argument. It doesn't change anything mechanically (up to 20th lvl), it just makes it better for Epic play.