That could simply mean that they’ve been around longer, not that they’re smarter. After all humans today are no smarter than they were 50,000 years ago. We’ve just acquired more knowledge and technology.
Ummmm, humans are dumber than they were 50,000 years ago. Brain size has shrunk measurably since then.
Pretty normal, really. All domestic animals are dumber than their wild counterparts.
They can afford to be.