OP here. There definitely is a place for running things on your local machine. Exactly as you say: one can get a great deal of consistency using VMs.

One of the benefits of moving away from Kubernetes, to a runner-based architecture , is that we can now seamlessly support cloud-based and local environments (https://www.gitpod.io/blog/introducing-gitpod-desktop).

What's really nice about this is that with this kind of integration there's very little difference in setting up a dev env in the cloud or locally. The behaviour and qualities of those environments can differ vastly though (network bandwidth, latency, GPU, RAM, CPUs, ARM/x86).