WC3 games run at a 250ms delay for stability by default. Even if you ping 5ms to someone, your effective delay will be 250ms.
250ms is also a pretty significant host advantage since the host has no delay.
LC does not move continents; it just allows those with under 100ms latency to each other to play at 100ms delay instead of 250.
If you need to play with people from multiple continents, sure, use the higher delay for stability. But I'm pretty sure that's why there are different realms also.
That's a purely client-side latency compensation technique; "LC" does nothing more than desynchronize clients, no different to the blatently useless Diablo II "TMC".
