Why do local compute when you can have a massive Kubernetes cluster in AWS running stockfish and every other engine in the world through an API call on a tiny ESP32 with ESP-NOW protocol to a nearby friend/spy? I/O is a few bytes and ESP32 has a ad-hoc network range of 50 feet or so. I joke about the Kubernetes part :-)
Yes, they are. The Stockfish game you can install on your iPhone would beat Carlsen almost 100% of time.