We have a set of those hyper heat mini splits to supplement a hydronic system which wasn’t expanded to several additions. They’re generally great but during the Midwest’s recent extremely cold snap down to a week or two of negative temperatures they were pretty disappointing and could not keep up. We ended up having to close off a few parts of the house to keep the temperature reasonable in the rest. I think that trusting heat to a heat pump system is not yet feasible in much of the Midwest and northeast.