Exactly. Superiority is highly subjective.
You could argue that if all conditions are the same and one rises while the other falls, that one is superior.
Or you can argue that if the one who would normally fall is able to alter conditions so that he wins, then he is the superior one.
Or there are some people who would even argue that the one who fails but did not compromise some moral is the superior one.
Biological superiority isn't subjective and in Thedas it exist.
Kryptonians are superior to humans because in the right condition they can do crazy stuff that humans can't do.
In Thedas ancient elves are superior because their biological assets allow them to do stuff that humans or modern elves can't do.
Had the fade been released those like Abelas,Solas and co would retain all their true connections to the world.
The lost elves in the crossroads are a proof of that they were living knowledge their mind,their powers were superior just like the Evanuris which are ancient elves can do crazy stuff an human cannot even dream to do
(just look at Ghilanain whom is implied to have created the Cetus creature powerful like archdemons),look at the anchor you die with it while Solas can master it
In our world this disequality do not exist among the same species,so every human despite the differences is not inherently superior.
In Thedas this however is not true ancient elves are biologically superior and this isn't racist this is just say the things for what they are.
That you can prove your value with another species due to invincibility curtain of the protagonists does not change anything