Without the TTT role assignment, you couldn't have Ts. Without the ze plugin, you couldn't have zombies. JB plugins however, are not required due to them only adding cool things here and there. You can play JB without the glitter, sure glitter might be cool to have; but is completely unnecessary.
It makes SG jailbreak stand out. And its clearly going well for us. We try to add plugins that might help, first one that comes to mind is the LR plugin, but they just aren't wanted by the community. Now back to the main topic, as it's been said in this thread and numerous others; JB will not be having this added. And I for one hope that stays true for a long while.