I agree that New players should not rush to level up on XP events. They do not learn to play the class and they do whine about not having enough TP. It is more beneficial to them to level their toon naturally, they will be better off in the long run. However, in saying this, there are a number of classes on ROM that require TP in only 2 or 3 skills plus the elites and you can smash those skills to be able to run instances. For me this is so boring, but it is doable and not a fault of the new players but just the way ROM is designed.
If you have 3 classes leveled and would like to get rid of one of them because it was nerfed, (Example P/S), then an XP weekend is needed. Otherwise your gonna be really slow to level and lose interest or you need to fork out the cash for resets and have enough gold to buy the outrageously overpriced dogmeat, until you can get to a level that does not require any farmed items. Yes I said BUY dogmeat, because to farm them is impossible with so many "others" always there doing it.