First of all, no one should feel unwelcome. No one is saying the shooters wanting to use their Limited or Production competition gear cannot shoot this match. They can and are more than welcome to do so.
Unfortunately, the "where does it stop?" question is addressing the wrong side of the issue. There have been 30 some threads (not posts, threads) detailing the divisions and what guns and features belong in each one. THAT is where that part of the equation stops. If your gun or holster doesn't fit one of these defined divisions, then you'll be placed in "Other," which was created just for you!
What competion shooter signs up for production division and expects to shoot it with fully loaded extended magazines and a BA (Big Ass) magwell using a Ghost race holster?? And if allowed to do so, how is it fair to everyone else who read and followed the rules?