It’s only huge in one synthetic benchmark which doesn’t represent what users do: sustained linear writes to storage on the lowest-end model where it went from two chips to one. How often do you need to completely fill the disk in 2 minutes rather than 3? If you did have a situation where you can meaningfully write data that quickly, you’d presumably also have enough data that you’d buy the larger models or you’d be using external storage.

Random I/O is the number most people are affected by and there’s a reason the clickbait commenters never mention that: you don’t see this large an effect and these machines are all more than fast enough for the vast majority of buyers. That will not get you a ton of YouTube impressions so it’s all about a use-case these machines don’t have.