It's generally agreed (here and Piloteers) that there are a higher number of 6AT issues/failures than would be expected. As discussed above, keeping on top of ATF changes, and possibly switching to a different ATF, may help.For anyone who has been a regular reader of this forum for most or all of the Ridgeline's existence and has a good pulse on the model, 56 reported transmission failures is most certainly concerning.
Whether individuals are concerned about this, or the extent of the concern will vary. Many 6AT owners just accept the situation, don't stress and will 'over-maintain' their vehicles accepting this weakness. One or two will sell their vehicles because of their concern. Fewer still (one on this forum) will sell their otherwise reliable 6AT, buy a 9AT and have it fail.
It's really difficult to quality the failure rate based on the information the public has, but yes, it's no doubt higher than one would want it to be. However, more qualitatively, the vast majority of 6AT owners should have a healthy vehicle. And if it fails, that's what extended warranties are for .
Anyway, need to go now, I have a Jack Russel figuratively nipping at my ankles again that I'm trying to ignore