I went from a 2017 MBP 15" to a 16" 2019 MBP late last year and the keyboard is clearly a big selling point but lets not forget how much better the audio is either. It's under played in most reviews but it's a night and day difference. I feel like I'm in a home theater every time I use it.
Ya, but before improvements were much more noticeable, and now they are much more incremental. They might be nice to have if you even notice them, but they don't really change the experience that much. And that isn't really surprising, when a technology is immature it will grow quickly, and when it matures, it will grow much more slowly.