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Well Noaani disagrees with you there, cause he's been saying that some EQ2 bosses never got guides because people wanted to be the only one who's able to beat it. AoC's bosses will most likely have a similar attitude, because bosses will be super contested, and if you know a mechanic that lets you beat the boss while any other guild hasn't even attempted the boss (cause you won in pvp against them), they wouldn't even know where to start and you'd have a huge upper hand.
But even outside of that. Why do you need meters then? If boss difficulty comes from visuals, you have no need for meters. But meters will allow you to figure out the best objective approach to the boss, so the boss will become trivial much faster and now you'll require Intrepid to make a "more difficult" boss, otherwise the content becomes easy for you.
Also, guides don't give every viewer the ability to beat the boss because there's still the high physical requirement to be able to push buttons correctly, move in a timely matter and have the ability to track everything and remember the whole guide. So even with guides, bosses could be <10% cleared.
But once the "meter people" clear them - they'll need better faster harder bosses or it'll be boring. Absence of a meter for the masses would delay this boredom. But obviously people will still use them and get bored and leave, if Intrepid doesn't make content just for them. I'm fairly sure that's the situation with WoW's current bosses, where most people don't even clear basic difficulty bosses cause after years of making bosses for "meter people", the skill floor was way too high.
Now obviously that's more of a WoW issue than an EQ2 (or maybe some other pve mmo) one, but even here Noaani said that people with meters will just clear difficult content and will need more.