I'd guess that like many bowlers these days they believe in their maximum hook philosophy and if they can't do that, they get physically and mentally uncomfortable. They do not think about what using such balls will do to the shot, which is surprising, given the fact that they own Eagles and must bowl in many tournaments.
I must admit that at times, I do that when I am not thinking.
Reccently I have read in some coach's column that the preferred philosophy in lining up your shot, whether in league or in tournaments, is to use a ball that is barely adequete to get to the pocket and carry. In this way, as the shot develops, wears away, and transitions, the (mild or weak) ball you started with will become more appropriate to the developing shot. You can use this ball better and better and the shot will come to you, as opposed to you have to make more drastic and sometimes more difficult changes in delivery or ball changes.
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"Just because you can do something does not mean you should do it."