A person's Class is tied to their identity—in essence, their role in the world.
Commoners were hardly worth anything; collateral who were meant to fill up the space in a large world. In essence, they were Extras by default.
The higher the Tier of one's Class, the higher the value attributed to them.
… And with this value comes Privileges.
These Privileges are not innate abilities, but special treatment granted to the person by the World.
Just as billionaires back on earth were granted some special authority and benefits by governments and the people around them—all due to the legal tenders in their possession—this world of H'Trae rewards those it deems to be worthy.
It isn't something you can reject or change.
For powers like [Limit Transcension], a choice can be made to use this power or not. But, for characteristics that the Class provides, there is no way to evade it.
It was simply the free gift of the World.