I’m actually thinking of the sociopolitical ramifications of both scenarios here.

I feel like if physical attraction between species was common, then we’d end up with crazy purity culture:
If they couldn’t procreate, then population rates would plummet, most pairings would be non-viable.
If they could then we’d still see people obsessed with species purity like how we see people obsessed with racial purity today.

I’m curious what an animal that was like 1/16th 16 random animals would look like. With so much selection, would everyone tend to the average of all animals after like 10 generations? Would we end up with a single blended specie? Would it reduce into a handful of different blends that achieved critical mass?