It's not relevant to raiding in BRF at all.
You're right in that it implies a certain dedication to get the kill but it doesn't necessarily imply any particular skill. Time learning a fight != skill. Note I'm not saying you don't have skill I'm arguing against the basis of your point.
All it proves is either a lot of gold to buy a boost or happening to join a group where everybody knows what they're doing which is what you need. It's not a 'difficult' fight - just requires people to know what to do. The mechanics themselves aren't overly complex.
I've done the whole raiding for EU top 10-25s in Vanilla and TBC thing so I'm confident in my ability to do my own job properly. I think I've messed up once EVER in Highmaul and that was borderline tanks fault for running the wrong way with the arcane on Ko'ragh but I should have seen and not ran through his path. Having played with many people with and without Curve I haven't seen any distinction in player skill. In terms of HPS I'm nearly always top except for Ko'ragh but HPS / DPS aren't really a massively important measure. I prefer to look at Damage Taken in terms of avoidable things as a measure of skill. Any old newb can stand still and rattle through their rotation doing massive damage but if you're taking ludicrous amounts of damage then you're probably a net drain on the raid.
I'm sad I just join HC raids even if I can't loot the boss. Do it for 'fun'
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I will get Curve before BRF because unfortunately a lot of people judge skill on an achievement but if it's their group they are of course entitled to apply their own selection criteria.