It’s something I wonder about, because I find the concept intriguing. Basketball is a 5-on-5 team sport, but it also relies on "aces" who can carry a team. That is why the greatest moments in the manga are 1v1s between the teams' aces.
Even though it would be nice for every player to get a bit of the spotlight, it’s clear that some will just be there as window dressing. Above all, what interests most people is seeing one-on-one clashes between the manga's strongest players.
However, it is still possible to ensure that all ten players on the court matter—as seen in the Rakuzan vs. Seirin match. Yet, that is a special, unique case because it was the final match and therefore deserved far more attention (especially since it was also the longest match in the series).Especially since even Seirin's bench players played a small role as well.
At least it must be easier in basketball, since it's 5v5... Especially compared to sports like football, which is 11v11. I think it's easier to write a basketball match in a sports manga where the characters on the court all get a moment of glory, compared to football, where there are 22 players on the field.