I remember when I had to explain this phenomenon to my kids, as well as that, once upon a time, you couldn't watch movies on your phone.
Now TV shows are often written with the assumption that they will be binged all at once, which greatly changes their narrative structures.
And there are practical considerations, too. Broadcast television doesn't have a pause button.
I suppose the way that Americans get anime is similar.
Also a lot of digital mediums as switching back to a weekly structure. The Mandalorian did on Disney+. Invincible comes out weekly on Amazon. It makes for better social interaction about the show.