Earlier quoted context omitted.
Not an expert but I've done a little reading and basically the combination of real time actions and a network makes it intractable, you end up just having to trust the client on some things (or having to make trade offs like a client potentially not having the information needed to display the game state to the player, or choppy/unresponsive gameplay as a function of latency).
>some things Any specific examples? I hear this said all the time and it's almost never true. Movement, for example: many decide to just let clients be fully authoritative over their positions and then act shocked when teleport hacks drop. Just keep track of the player's max move speed server-side, continually validate, and flag if they consistently move faster than is possible according to the server. No one is ever…
If I remember right an anecdote from someone in the trenches was along these lines for a more complicated real time game, though I think the peer comments have the more typical types of problems. I looked for the thread I was reading this in but came up dry, sorry!