The Beauty of WoW is that Pre-Ordering is easy: you see a lot of content before it gets released, and if it looks like it's fun, i will pre-order it shortly before 10.0 comes out to play the Drakthyr. But Pre-Ordering now is stupid, i want to see at least the beta.
But in theory, YES I WILL PREORDER. Because why not. When the game looks good, the class looks fun, then pre-ordering it a week before 10.0 gives you the same benefits, and heck, if you plan to return there is no reason to buy it after the release of Dragonflight: you miss out on the pet. Just saying: BURRR, PRE-ORDER BAD is stupid. Because as much as people really shit on wow right now, in the MMO-Genre you already can see if an expansion is bad or not. On other games outside of it with no open beta tests, there yes, pre-ordering is stupid.
That said: i will get only the Base Edition: i want to play, not boosting my character. And i have already have many mounts, why should i buy one?