But that's where you have to balance the gain updating the old toolchain against the benefits in your specific situation. Are you going to spend a lot of time on the project, or is it just a few bug fixes? Can you revive the old toolchain? Is the old toolchain churning out good enough production ready assets?

Upgrading dependencies can be a trap. Like, in the past, I've delegated a bugfix that shouldn't take more then an hour or two to a co-worker, only to see them waste an entire day in dependency / NPM hell.

To my mind, there needs to be a compelling case or argument that justifies sinking time in an upgrading exercise.