It seems that most of the recent comments from owners who are satisfied with the seat heat output are from owners of the 1958 Edition, which has cloth seats. (There is a comment from a 1958 owner who has very little heat, though.) And most of the commenters having poor seat heat output seem to have either Softex or perforated leather seats. There are a bunch of commenters who didn't mention which LC model they have, though.
Just trying to see if there is a discernible pattern to mention to Toyota or a dealer. Not there yet though. What is clear to me is that Toyota's seat heating implementation is a lot better on the RX than on the LC, at least when using the LC's ECO drive mode. And, this is possibly also true of the seat cooling, but I need to check that further.
Any more comments on this are appreciated...........just be sure to mention your LC model and drive mode.