I’m part of a utility group but I mostly work with DOE and the national labs.

The unbalanced phasing in distribution can make solving powerflow harder, but the big problem we face is data quality and volume in the circuit models—one substation and its feeders typically have over 10k circuit components. The detail is needed since the model is used for outages, work orders, and engineering planning. On the plus side, at least the data security issues are way less severe than transmission models.