Animal that could reach large size, and reproduce competitively to produce larger offspring are homogenized in the process. Not only are food stocks smaller and 'over fished', but the animals we do get are smaller in size and stature, compounding the problem. On balance, we've improved farming and domesticated animal husbandry. Albeit, that we've locked many species into evolutionary sidetracks, as far as humanity is concerned, we've gained in some ways. One of the things humans aren't very skilled at is how to live as a co-evolutionary companion with other life forms.
Dynamic evolution is an integrated process.
What one species tries, all the others have to come to terms with. Killer honey bees have a gestation period for their queens that is two to three days shorter than the non-agressive varieties. That single simple advantage means that aggressive-gened queens kill their competitor queens sooner. And the calmer species are driven to extinction. But for people, we revere individuals more than 'types' of people.