Er.. what? How exactly is that a convincing sell?
Look, since you seem to think having to "spend 1 more ability point" isn't a big deal, then let's just keep things as they are and let the Rogues continue to spend 1 more ability point (rather than trying to pass that burden on to the Rangers).
I sense a little bias in that claim. I can't think of a single class that couldn't use some extra points.
Ever heard of Sneak, Pickpocket, and Lockpicking? Those are traditional Rogue skills, not Ranger skills. Rangers in this game take things like Crafting and Loremaster because they don't need points elsewhere as badly as other classes.