I wouldn't say we're so-much 'designed' for it, moreso that our food environment has made us far better-suited to be omnivorous in terms of efficiency of nutrition.
It's way, way easier to get everything you need when every food is an option. Less options, less access to nutrients.
I think for muscle-building it really comes down to amino acid content and balancing proper protein intake with a fiber and volume level you can live with and also absorb everything you need. Without meat/dairy/eggs, etc, it's harder to do and gets more boring for sure.
One could argue that if humans absorb dietary cholesterol and see negative health outcomes from saturated fats, etc, that consuming animal products really isn't best for us, but of course a balanced approach solves this, too.
In short, it's most likely best to eat SOME animal products for performance/health, but with the majority of calories coming from whole plant foods.
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