I think I understand.
The F-82 Mustang had down flexion angular momentum induced loading (torque) from its two Allison engines. This had the load stress concentrated on the midwing that forced an up bend in the air-frame at that bridge load span. Reversing the spin of the props had the exact opposite effect with the stress load now down and still stressed the mid span beyond its bend factor, so I don't understand what that problem has to do with an electric gatling gun. I need clarification on that point so I understand the connection.
Phalanx (the US version with radar, optics, ammo bin and gun and unitary articulated mount) all up is about 92 tonnes. I think that explains the weight factor. The thing is designed as a complete bolt on to have as small a deck print as possible. The Myriad does not look to have that small footprint. And I suspect the barrels are too close together. Zenith's barrels most certainly are.
As for efficacy. The table at https://defence.pk/pdf/threads/naval-artillery.230134/
is most interesting, but of those CIWS weapon systems, AFAIK of the "western guns" only GOALKEEPER and PHALANX have been shot at for real under combat conditions (Iraq and in the land versions in Afghanistan.). I happen to like GOALKEEPER better. The Russian gatlings are highly suspect because they have been shot at as well (Same wars.). The ships those were mounted upon... sank.
By reputation alone, I like Oto systems a lot, Siemens/Signal as well. Radar/gun/optical/lidar integration is good. Kashtan... (The 230s, no 630 pair has been tried yet); not so much. Russian CIWS fire control is highly suspect. Again, proof of war.
Testing on the missile range at Sardinia or off the Kola Peninsula missile range is not the same as dodging Termits or CS-4s off Al Bakir.
Until that proof in battle, one cannot really assess any claim as to the authenticity of effectiveness.
At least Phalanx has that much going for it. It actually works against all kinds of incoming (including mortar shells and free flight rockets), rather well.