I'll tell you why I use the classical editor instead of Gutenberg, it's just simpler for what I want.
I want to blog. I don't want to build pages or any of that crap. In addition, I can get my posts put into columns much easier using a plugin with the CE than by using the mal -coded crap available through Gutenberg.
Now if we could just get somebody to integrate those Gutenberg plugins with the classical editor.