It would be interesting if the birthsigns system or racial bonuses affected your max stats. So whereas there's still very much the potential for a dedicated Orc to become a more skilled mage than an Altmer, at the end of the day there would still be a certain level of proficiency that some races simply can't reach. The choices you make during character creation are practically meaningless by the endgame, which is too bad as I'd prefer a system that rewarded planning and character diversity.
Are you talking about Oblivion here? The racial bonuses definitely do affect your maximum stats. An Altmer will
always have a constant +100 Fortify Magicka, over and above any other stat, a Breton has +50 Fortify Magicka, etc. Those differences do not go away.
Likewise, a character with the Apprentice birthsign will always have a +100 Fortify Magicka, the Atronach +150 Fortify Magicka, and the Mage has +50. Those differences do not go away, regardless of character development.
In your example, with all stats maxed, an Altmer with the Atronach Birthsign will have a base Magicka of 450: That's ((100 Int)x2)+100+150. No other race/birthsign combination will be that high. The Orc with a non-magicka-boosting Birthsign will have a base Magicka of only 200. Big difference.