@Vander18 Reread my post. I didn't say it was impractical for Representative players to play Domestic ball.
I suggest it is impractical for Associations to force players to play Domestic ball with a team in their Association as a pre-req for playing Rep ball for the same Association.
As you say, your Association is a "large one". Not every Association has the same luxuries that yours appears to have. And even you say that your Association grants exemptions to some of its own Rep players.
For sure, in a perfect world, a player would play Rep ball with the same Association as the Domestic team they play for. That was the original meaning of REPRESENTATIVE basketball. And it worked well back in the day.
But times change. I know of many players - particularly in Girls Basketball - that play Rep ball who play Domestic for a club in a different Association, or don't play Domestic ball at all. They do so because it seems to be to best way for them to further their development and take advantage of opportunities that are often not presented to them in their "Local" Association for a range of reasons.