Like most content creators on YouTube Preach is going to do whatever is best for his stream and revenue. When it was best to announce he was done with WoW he did that. Now that there's a new expansion he's reversed himself. It's just business. To question the sincerity of it is only to point out the obvious. Check in a few months from now and see how it's going.
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Warlords was a decent expansion for raiding. If you didn't raid it was less decent by quite a bit.