if the new player doesnt know the tactics they should ask.
In all fairness, depending on the encounter/dungeon/whatever, you don't always have time to ask and other times they don't bother to tell you or speak at ALL even if you ask. I've seen this happen several times. Half the times in these situations, I end up trying to explain it and sometimes pre-typing boss strats because I know the tank (who is usually the experienced one, not always but mostly) is going to quickly rush into the boss when we get there.
Thanks to that most of the times, we don't wipe and if we do, we beat the fight the second time round (providing the experienced members don't rage quit because of 1 wipe >.>)
I did have one incident with one new tank and one new DPS in Ultros. Never even got the chance to ask who was new (figured it out based on what happened before the wipe) or tell them what to do.
We did win the second time though so it wasn't too bad but yeah, point is, you don't always get time to ask for strats which can cause wasted time especially on battles like Ultros which requires the DPS to not get killed and do the mechanics or else the fight resets.