would another one have ditched due to a failed shaft in the 9 months since they have been grounded?" And the answer, now that we know the cause, is almost certainly not.
I admire your optimism Sir and unfortunately have to disagree.
Let me put it another way to you.
The oil and gas environment probably brought something to light a lot earlier than it would have in other operating climes.
Be careful with what is painted on the inside of your goggles.