It would be easy if all you had to do was make it simpler, but I don't think that's it. Good writers always sound like themselves, you're reading along and you feel like there's a whole person there saying something to you, it's really them and not anyone else. It's magic.

If the average person tries following this advice they'll probably end up with something simpler sounding, and still bad. Which I guess is better than overly complicated and bad? I don't know, doesn't matter, both are bad.

One thing I know for sure though is writing like you talk is dressing down. Sometimes that's good, like when you want to be relatable and down to earth, or maybe you're saying you're a tech bro type, moving fast and no time for nonsense. Other times you should be more formal though.

Again, the great writers don't care, they just pick whatever level of formality makes sense and do their thing.