Hi,
I do see that this could have applications on the vehicle itself either between the vehicle and surface/TMS i.e. umbilical or tether or alternately on various tooling.
However, as anyone with any experience in the industry would know, tether/umbilical management is a key pilot skill and NOT having a slip ring (whatever the nature of the power/signal passes) reduces maintenance tasks and increases ROV reliability. Additionally there is an obvious requirement for oil compensation and the structural engineering issues with a work class weighing 3 tonne +/- (in air) plus dynamic/shock loadings.
I see this as probably more appropriate for light work class / inspection type ROVs.
Additionally, this creates another spares requirement and introduces the issue of inline splicing of the umbilical above the slip-ring unit in the case of this being the umbilical / tether interface.
Cheers