All I'm saying is that Blizz destroyed Levelling in my opinion. Having the option to get it all out of the way so quickly was a good idea, while still having the option to clear it all like one normally would. WoW is a game that's meant to have options, and ours has been severely reduced to 2 options; "Heirloom On," and "Heirloom Off." They even killed RaF exp gain and it no longer stacks with Heirlooms. They even killed the SoR for no reason at all. Feelsbadman.
As late as possible. Early on, you’ll want to follow the missions in Battle for Azeroth right up until you get the option to send a follower on a two-hour long quest. As soon as you get there, stop doing the War Campaign missions. You can come back to them once you have reached something like 119 and a half and finish leveling with those if you want. If you don’t use these missions to cap off your leveling journey, then they’re the first thing you’ll want to do once you reach max level.