Now, I've heard there's a bug where you can't properly find End Portals in the Frontier. Since fixing this would require resetting the Frontier, and perhaps people would like to have permanent locations for End Portals (as opposed to finding new portals when the Wastelands resets). It is also worth noting that with the new End content in 1.9, a Wastelands End would be helpful for regulating the economy (as otherwise things like Elytra would cost millions of rupees), so being able to have End Portals in the Frontier would be useful for people who just want to build in the End.