No, I'm saying things I know to be true, because developing 3D multiuser apps in game engines is a large part of my job (and has been since well before AI). I have spent thousands of hours using Unity Netcode, Photon, Mirror and Unreal Networking.

You can throw a couple GameObjects into a scene and synchronize them pretty quickly, but that does not a multiplayer game make. Every single script you write will be more complex when you need to keep multiplayer in mind and testing anything you've written becomes much more involved. This is especially true for a large Open World like Big Walk's.

I have worked on an online Unity game, and it was not made in a day. It even came from a good template of a starting point, but everything you build on top of it is extra complexity that needs to be tested, debugged, and fixed.

Trivializing other people's professions is what AI-bros love to do the most. "How hard can it be to scan grocery items" ahh comment.

Yeah, the tools in these engines are really good now and do all of the heavy lifting for you.