The actual concept of a user/maintainer is good - the Yanks did it very well for donkeys years. However, when a fully paid up member of the RN good ideas club sees this, then gets the bit between his teeth, then there will inevitably be problems. The Elmers had had years for their system to evolve - the RN intended to jump straight in. There were several presentations given, at which the 'team' were told by tech Senior Rates (and possibly some Seaman types) that it wouldn't work, but as with all good ideas, it was thrust upon us.I think OMs would've worked if we'd actually committed to it, not just use them as source branch ratings who could change a fuse.
I feel sorry for all the troops sucked into this debacle over the years.