I think the most common use can be seen when people try to use "boxing math" (i.e. Fighter A beat Fighter B, Fighter B beat Fighter C, so Fighter A would beat Fighter C).

Look at 70's HW boxing. Ken Norton gave hell to some of the slickest boxers of all time (Ali and Holmes), but he got easily crushed by the big bangers he fought (Shavers, Foreman). Same with Frazier (gave Ali fits 3 times, got totally destroyed by Foreman twice). Norton had a style that made him poison for guys like Ali, but he didn't have the style to deal with the power of Foreman. Different fighters, different challenges.

Styles make fights. A PBF vs Canelo fight would look different than a PBF vs Trout fight.

My favorite style is that of the slick defensive counter puncher (like PBF or James Toney). The hit-and-not-get-hit guys have the best style.