If you take a lot of hard classes and get B’s, your unweighted GPA would be low while your weighted GPA would be high.
If you have a rigorous course load, you still need at least mostly A’s to be considered competitive for top schools.
Top colleges generally look at your transcript instead of the GPAs. I think that unweighted matters more as it basically tells you how many non A’s the student received, and the course rigor can be determined by just looking at the classes on the transcript.