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I think only a handful are nervous about it, a majority really want the curve. But in the end everyone is reasonable, if it doesn't work I'm sure it will be tweaked for the next HF.

Everything is a matter of balancing tradeoffs. Risks and costs versus benefits. Many are nervous about the curve because it has potential costs and risks but also benefits. On balance, the potential benefits carried the argument for now. That can be revisited or adjusted later with experience.