Its not "impossible". Like everything it just has to be done right to get the most out of it. The system is only as good as the weakest link. Not just any amp is likely to cut it with the Magicos.
I heard the minis off a very pricey VAC tube amp and a 6 digit system overall at Sound By Singer in a smaller showroom. That combo was top notch, as good as anything, at least at modest volume in a modest size room. The VAC had plenty of juice for the speakers in that room at modest volume. Did not try to go concert level though its not unreasonable to want to be able to do that. I do. But it may well take larger speakers as well to do that. Most monitors can’t, but Magico Mini’s are not most monitors.
Also headroom is not useless. It’s your insurance policy against clipping.
I heard the minis off a very pricey VAC tube amp and a 6 digit system overall at Sound By Singer in a smaller showroom. That combo was top notch, as good as anything, at least at modest volume in a modest size room. The VAC had plenty of juice for the speakers in that room at modest volume. Did not try to go concert level though its not unreasonable to want to be able to do that. I do. But it may well take larger speakers as well to do that. Most monitors can’t, but Magico Mini’s are not most monitors.
Also headroom is not useless. It’s your insurance policy against clipping.