I think it's more along the lines of them being scared/worried about potential game balance shifts caused by any "major" adjustment, as long as it's not related to their current darlings, PUP/SMN.) :/
I'm also pretty sure that what I said earlier is accurate. There are definitely quite a few encounters where pets take EXTREME damage and I just don't see something like that being intentional.
So, how about DRG's wyverns get an innate "Damage taken II - 50%" traits? Might seem excessive at first glance, but in my experience, wyverns are at least as squishy as SMN avatars and don't have the extra HP pools that BST pets have, so this might actually be fair. Wyverns are far less micro-manageable than any other pets, so I don't think it would be a bad thing at all to increase their survivability. The value is of course up for adjustment if that is the only thing that would prevent implementation, however, I believe it should be 30% at minimum to allow it to be significant/noticeable even if you hit the DT1 cap. This suggestion bypasses the concerns stated by the ComRep, so please do pass it on to the dev team.