[arahant]

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So are species.

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Species according to Mayr - groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups.

So, interspecies reproduction cannot make fertile offspring.
You see that as a construct?


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Clearly a construct. I have two different 'species' until I put them in geographical proximity and they interbreed. There a dozen different definitions of 'species' for the same reason there is no universally accepted definition of race.
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Also, what's the designed use for classifications of race?

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Identification of members of the species most likely to share my genetic material, and hence to create offspring that tend to reproduce my genes.