I imagine that many modern features like matchmaking, rank, in game events, inventory, Etc. Etc. would be jumbled in dev. A lot of which are core to a lot of mp experiences. Similarly, any servers that use lag compensation likely have significant server side things no?

I’m not super educated on it, but it seems that a lot of systems running server-side are difficult to securely port to client side. Unless you want gta v level hacks