That depends entirely on the circumstances (whether the performance increase of the
local machine can get you that, that is).
It's really a very specific niche that's targeted here: namely mobile(!) video editing and -production.
There are very few use cases these days that benefit from a high-performance mobile (cannot stress this enough) solution.
So unless your specific use case benefits at all from local processing power, I'd argue that it'd be hard to even get a 5% productivity increase that cannot be reached by other means (better/bigger display, more ergonomic peripherals, optimised workflow, etc.).
I'm not denying the fact that even a 5% improvement may justify the price difference. I'm just questioning whether the improvement in performance can meaningfully contribute to that in most use cases.