It's not really an assumption if I say "if". I can agree with you that shifting as much data as possible on the server is best. Valve already does that pretty well for counter-strike. Far more than other competitive FPSs. They still keep shot registration on the server whereas most competitive shooters now have that on the client to have the correct gameplay feel. The big balance between keeping stuff on the server and putting some authority on the client is the gameplay feel. Counter-Strike has been and still is notorious for getting shot around a corner when you don't see who shot you. This is because of server authority rather than client authority.