Levelling your Race

A thought occurred while discussing races with my group.. can you level up your race?

I'm a 5th level elf

If classes or professions are a 'set' of bonuses that are applied as you level up, why can't we have a set of 'racial' bonuses that we can choose to 'level up' as well?

I'm curious as to if any other game systems do this too, One that seems closest to the bill is Legend, but its not exactly a specific "level up" so much as just getting Boon bonus's to your race skills.

For the d20 fans, It would essentially be a set of skills, feats and increasing bonuses such as night vision or will save. A decent DM/Games designer could probably come up with a decent list, but the questions for such a system would be, why bother to level up my elf, when I could level up my class?

Maybe if DMs were a little more restrictive with their classes, then this would be a viable idea. i.e. Elves are not allowed to take rogue classes normally (alignment, disdain for such a career), yet elves are stealthy, especially in a forest, so maybe an 'Elven build' with stealth skills, ref saves and the like, Evasion, Uncanny dodge, but none of the Sneak attack, Backstab, Pickpocket skills.

For full Dungeonworld rules, there would be no real point, all skills are able to be increased, and only your motivations to increase them hamper or help this. I already have background skills lists, so this too serves its purpose and you may choose to practice and improve your background skills as you choose..

Yet, Dungeon Delvers Twelve, the simplified version rules, relies on the tropey level up sets of bonuses, pre-chosen to help newer players in understanding their characters better, guiding them. 

This, would be useful to have a 'levelling system' for your race, it would represent the players choice in increasing their background skills.. it could be an interesting set of bonuses, traits (and or flaws) skills and racial goals.. as you think more of your culture, your family and your race, as you return year after year to continue your racial training, you learn more of the racial divide between certain cultures, possibly racial hatreds, which give you combat advantages when fighting the 'enemy'

Just a few thoughts at this stage.. we'll see if I introduce it or not.