(Yes, I did make an apples and oranges joke.)
(Yes, I did make an apples and oranges joke.)
[Removed my Anatolian criticism: I just hadn't zoomed in enough!]
Maybe your brain works differently. I had this kind of misconception, imagining languages to be Pangea-like. That there used to be less linguistic diversity, there was a big uniform language (and perhaps a handful of others far away on the Earth) that later on fractured. But reality is more dynamic. PIE was just an ordinary language. And there was likely more linguistic diversity than today, due to less communication and travel opportunities and geographical features being more isolating.
These PIE charts do suggest a message that humanity was kinda more unified, or humans (or these regions) were still one big family at that time, all spoke PIE (again, except for faraway places), and it later fragmented.
I'm not saying that this website is bad or should be changed. I'm adding extra info, that sure it's useful, and it should be enjoyed with the knowledge that PIE was one normal language among many, existed in flux, did normal exchange of vocabulary etc with other neighboring languages, most of which are much less knowable compared to PIE. Europe used to be populated by non-Indo-European languages. In Greece, a lot of the -nthos words are likely borrowings from such a non-Indo-European language that was spoken there before Proto-Greek.
Maybe it's the curse of knowledge if you know all this. But I think the average person doesn't really have a reasonable mental map about any of this.