So, a user shouldn't be given the option of maintaining the sound of their old presets while at the same time having the option of using the new impedance curves? Basically, you're suggesting that any user who wants to maintain the sonic continuity of their old presets should have to install firmware 10, which means they can't access any of the new impedance curves. Why would you not want to give users the option of maintaining the sound of their old presets while also allowing access to the new impedance curves? If you want to update your presets, go for it, but why force someone to update who may not necessarily want to? Seriously.
Like I said, I think some of the default curves in firmware 11 sound better than some of the ones from v10, but of the presets that use curves from v10 that I prefer, I'd at least like the option of having them in presets I'm in the middle of using for various projects.