Reg2 was critically dependent on membership numbers. Reg3 is not; they are for the convention's use, not the program's. For conventions that don't need membership numbers there should be an option to turn them off: don't require that servers have membership numbers allocated, don't assign them, don't display them, don't print them.
But: when you are working with several similar entries, it can be helpful to have a unique ID to use to talk about one versus another.
Reg2 was critically dependent on membership numbers. Reg3 is not; they are for the convention's use, not the program's. For conventions that don't need membership numbers there should be an option to turn them off: don't require that servers have membership numbers allocated, don't assign them, don't display them, don't print them.
But: when you are working with several similar entries, it can be helpful to have a unique ID to use to talk about one versus another.