It's not that the Immortal Shuttle can't be made; it's just more cost-effective to ride!
Jiang Yuan currently has two main objectives as he heads into the Void: Firstly, with another one or two tasks completed, the courtyard should be able to upgrade to Level Eight, but right now there's no suitable Land Without Master for Fusion yet;
He wants to find a large piece of Land Without Master to expand the courtyard's usage area as much as possible.
Secondly, Old Dog's side mission has been hanging for quite a while, and he should at least take a look at the ruins of Lantian Domain to see what kind of place it is.
If he can directly integrate it, whether into a sub-instance or the main courtyard's area waiting to be unlocked, it would be much better than drifting in the Void.
To be honest, after reading Yun Shu's experiences, Jiang Yuan is quite wary of Void black holes.
