Stopped reading there.
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Levels indicate a players progression. While that progression doesn't have to (and really shouldn't) directly equate to an increase in power, I doubt many players would be happy about playing a game like this without seeing improvement in their character. Competitive games, and extremely story-driven games can get away with it, but this is neither of those.
Level scaling isn't a perfect solution, but it's better than how drastically trivialized content becomes when that scaling isn't in effect. Unless one finds god mode to be a compelling source of entertainment.
This level sync bs is a total shitfest really don't get how people enjoy that crap.
The only purpose of leveling in WoW is to be nothing more than a time sync for hitting max level. One thing I'd like to see Blizzard do is make gear actually meaningful during leveling progression. Not just toss out gear upgrades freely with random stats. Allow people to unlock the dungeons as they progress through the story lines. Create real-time events throughout the world that allow people to gather and participate for rewards that are actually meaningful i.e. better gear drops than those from questing or mob drops. The world needs purpose and I think at least some of it should come from the time you're leveling, and not just from professions and gimmicky rares.