These things happen during prepatches. There are always kinks to work out, and typically those kinks are offset by the items and experiences players receive during the prepatch events themselves. The vast list of bugfixes demonstrates just how doggedly Blizzard developers are playing whack-a-mole with in-game issues. But in the past few expansions, it's become a bit of a trade: Hang with us during the rough patch and we'll reward you with goodies and some seriously overpowered, fun gameplay, Blizzard seems to say.
Heirlooms can certainly be used with our guides! You may find yourself getting ahead of the guide. If you start doing gray quests, just skip ahead to a later zone. The guide is just that - a *GUIDE* not a rule, as many people seem to think. Feel free to skip parts! Watch out for quest chains, though, especially in the last part of the 50-60 section. Hopefully we'll have some awesome features in our new addon that will make it easier to skip around!
Players’ relationships with the NPCs around them have been hit-and-miss over the years. One of the original issues with Thrall, the Horde’s original Warchief, is that players began to refer to him as “green Jesus,” because of how infinitely powerful and infallible he was. But he’s been gone since the Warlord of Draenor expansion, and with the death of Varian Wrynn and Vol’Jin at the start of Legion, the old guard hasn’t been there to guide players the same way as it used to be.