That page pitches Nomad as a direct and better competitor to K8s. Both are considered as container orchestration platforms, though nomad can orchestrate other types of jobs as well.

When it comes to scalability, the anecdotes I've heard says that Nomad is better. Even the page you provided says the same. (I did try Nomad. But didn't scale it enough to test this).

The only real issue that I faced with Nomad in comparison to K8s is running certain infrastructure loads like CNI and CSI plugins (like longhorn and mayastor). They don't just talk to K8s through the standard interfaces (which Nomad also has), they often integrate deep into K8s using operators and CRDs. Nomad doesn't have the provisions to support such nonstandard deep integrations.