Interesting discussion. I come down on the side of having a deeper roster to provide an insurance policy against injuries.
I haven’t seen data to support this, but my sense is that WBB players have become, on average, bigger and faster than they were 20 or 30 years ago. As a fan of other sports such as hockey and football, I’ve seen a trend toward bigger, faster players. Some of this is a consequence of changes in the athletes being recruited, and some is a result of advances in training methods.
What this means is that in the present era, there is an increased likelihood of more violent collisions. It’s basic physics, F=ma, force (F) equals mass (m) times acceleration (a). If you have bigger athletes, with more mass, who can accelerate more quickly, they can hit each other with more force. This increases the likelihood of knee, head, and other types of injuries.
John Wooden famously said that he would rather have a good athlete who is a great team player than a superstar athlete who is not a good team player. Perhaps I’m old school, but I think you want to have some great team players who are unselfish and are willing to accept not having starting roles, but can step up and help the team when necessary—such as when a starting player is injured. I believe there are players who are willing to accept that sort of role, particularly if they have scholarships to help them get a good education.
In the modern era, having a short roster is flirting with disaster. One or two (more) injuries to key players, and the team could be up the creek without a paddle. Again, I think it’s wise to have a bigger roster as an insurance policy against injuries or illness.