The main reason, in my opinion, comes down to how Go as a language was designed. I have written some follow up posts to that, specifically this one: https://andrewpillar.com/programming/2022/10/24/a-simple-cru... wherein I explore creating an ORM-like library via generics in Go, this may be of interest to you if you want a better understanding of how some of these things would work in Go.
The main reason, in my opinion, comes down to how Go as a language was designed. I have written some follow up posts to that, specifically this one: https://andrewpillar.com/programming/2022/10/24/a-simple-cru... wherein I explore creating an ORM-like library via generics in Go, this may be of interest to you if you want a better understanding of how some of these things would work in Go.