“We would prefer a targeted solution versus just applying a band-aid fix that could mask deeper issues that could cause problems down the line, but at some point it’s not fair to give you a degraded experience for the sake of that investigation, so we’ll likely go ahead with a blanket health reduction in the near future while we continue to investigate. Either way, the current state is not the game experience we intended, and it’s something we will fix.”
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Stormheim is the zone you want to start it. For some reason Legion treasures are not worth any experience like they are in WoD...except in Stormheim. I haven't been able to find out any reason for this, and it's possible it may get fixed/nerfed at a later date. But for the time being you REALLY want to jump from treasure to treasure to augment your quest experience.
Arms is the best leveling spec for Warrior in Battle For Azeroth. Fury is a great single target spec, but lacks the AoE needed to compete with Arms. You will be striving to fight 2-3 enemies at a time for optimal results and Arms has the perfect spells and talents for the job. My tests have shown the average amount of mobs you will fight at once is around 2.3, which makes Sweeping Strikes amazing for leveling. Perhaps my favorite combination in the game is Avatar + Ravager + Sweeping Strikes. It slices down large packs of mobs in seconds.
Edit 20 It’s been a week since this post and a lot of people are still reaching out to me with questions which is fine. I have had a few different people reach out to me to help make YouTube videos based off this guide and more info in BFA which I’m more than willing to do. Whoever gets the videos up first I will link them here for you guys to enjoy.