I would argue that humans these days are equally as intelligent as the ones from 1600 years ago, the difference is now technology allows us to all communicate with eachother effectively and collaborate on larger projects

So we SEEM smarter, but we're not actually smarter, we just have better technology

So next time we have a leap in technology, those humans are gonna SEEM smarter then us, but that doesn't mean they are. They just have better tools, and are taught "differently"