The RPG I'm working on is about freedom in creating your character, so recently I've been thinking about the concept of races in RPGs. We have races of humans, elves, dwarves, halflings, goblins, demons, draconians etc. But when it comes to mixed races, we only have half-elves.

If we wanted to include every possible combination of races, we could probably fill an entire book with them and balance them somehow. Unnecessary effort. So I came to the conclusion that the best solution would be to eliminate the concept of race as we know it. What is race? Just a set of attribute modifiers and a few traits or abilities (appearance has no mechanical significance). By breaking down the "race" into these few components and describing them with some numerical value, we can create a system of, for example, 4 Tiers: Weak, Average, Strong and Powerful. Within a specific tier, the player can be given the opportunity to choose a larger or smaller number of traits, abilities and attribute modifiers, which would allow for complete freedom in the creation of their 1/4 human, 1/4 halfling, 1/8 goblin, 1/8 orc, 1/ 8 dwarf, 1/8 Tabaxi by selecting the "genetic" traits that he believed would be dominant in his character. Players would play within one Tier or, in the case of mixed Tiers, higher Tiers would need more exp to advance.

Was there any game that tried a similar solution?