I think important characteristic of such cliff is sharp cut of top (with various crack). This is what min device in HYLKs graph do. Damn elegant solution, I really like it.
You technically dont need new device to anything, WM has really good foundation, but it is about artistic friendlyness Artists are not technicians and vice versa. This is reason, why many artists around me switched to other SW. I would too, long time ago, but WM is the only one, which handles complex projects without crashing and with reasonable speed and has tiled build, so 8k+ is achievable.
Btw current competition (both) is based on Unity, which is death sentence for this kind of use case, so I dont expect any improvements in this area (speed, crashing) unless completelly rewritten on appropriate platform. Good for you