More 'wild speculation' ... for goodness sake man. And just who do you think would be privy to the kind of design data you're referring to? Try getting that sort of material out of Boeing or Airbus for example .. you're not serious surely??
As to tail plane failures, there was only one: As i explained above, the one which crashed while in DSTO custody was due to the organization which had prior custody of the aircraft not carrying out a mandatory inspection before hand-over which would have discovered a stabilator spar crack for which there was an available repair kit waiting on the shelf.
End of 'speculation' ... thank you.