Berrios is only here two more years.....by the logic of your first paragraph, they are looking at a full on rebuild after 2022, if I read that correctly, anyway. Why not start with more assets?
If a team wants a very good pitcher now, not in 2 years, he's more valuable to that team than someone that will be ready in 2 years.
That said, I'm sympathetic to waiting until the middle of next year....which given their ability to develop pitchers, and willingness to spend real money on them, doesn't look all that promising either....