TDs have the option to create tournaments with ratings based divisions only, but it's not a very popular format for some reason. I played in one a while back and it was a blast. Playing with both male, female, young and old. The PDGA definitely needs to push this more often to TDs.
I agree that the PDGA offers them, and they are fun. I've played in them, and run one every year, of a sorts---it's a 4-man team play event with a team ratings cap, so women can and do fill team spots exactly the same as a same-rated man would.
I'm not so sure how the PDGA
pushes them, other than publicize the option.
TDs will do what players want. Or, what the TDs believe that most players want. After all, if we're going to all the trouble to run a tournament, we want people to come.
There are a few drawbacks to ratings-based events, which also touch on the broader discussion here:
The Pro/Am divide. If the highest division, with unlimited divisions, is "pro", then Ams of that rating are forced to play pro. They will likely decide to skip the event, instead. Meanwhile, women are pretty much precluded from playing pro, because few or none will meet the criteria. The better female players may skip it, as well.
Division stability. Players near a dividing line will bounce back and forth between different divisions, from event to event. This week you're at the top of one division, next week you're bumped up and at the bottom of another. Many players like categorizing themselves as a certain division, for a certain period of time.
Social considerations. The big one. Many older folks like playing with other people their age. Teenagers may too, or older players may not want to play with teens. Women may be more comfortable playing without men---something they may not get much opportunity to do, outside of tournaments. After all, you have to spend an entire weekend with your division. Players to whom these considerations are important, may not show.
Top of the heap. Protected divisions (age or gender) exist, in part, because of natural limitations on athleticism in those groups. It has nothing to do with the gifted physical attributes certain individuals may have; players over 50, for example, on average are much less athletic than 25-year-olds, and the best >50 can't compete with the best <40. Same thing with females. There's more satisfaction in finishing first among your peers in one of these groups, than finishing first among people rated less than 900.
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These are not insurmountable, and it would be great to see more ratings-based events as an option, and a refreshing change. But they are considerations when doing so.
Tournament attendance is voluntary, and the PDGA is a member-run organization, so the player preferences will affect the decisions of TDs and the organization.