Having studied the EU theory a bit, I think they have a better understanding of what goes on between planets, star systems, galaxies and so forth. With the entire universe being filled with electric energy, and plasma and manifestations in Birkeland currents, plasma discharges, etc. I think their understanding of craters being formed by electric or plasma discharges better fits the evidence as well. Such as at Meteor Crater in Arizona, etc.
I think there can be a merging or combination of the two theories quite easily. Perhaps the authors of UM could look into the EU theory.