Modern netcode can hide a lot of this latency. You can definitely play with someone far away, though the experience won't be as consistent and reliable is with

Modern netcode can hide a lot of this latency. You can definitely play with someone far away, though the experience won't be as consistent and reliable is with someone nearby. But things are always improving! Most of the issue is with jitter, not latency. If you had a dedicated point-to-point link to your friend in Vietnam you could play a flawless game of Mortal Kombat for sure!