Thank you for your comparative thoughts on the different generations. I read a lot of your posts and appreciate your detail and your overall motorcycle experience when posting, so I'm a tad befuddled at your time on the new GW, especially having tried 2 newer bikes and still having the same thoughts. Maybe the first 2018 ride was a lemon somehow but then riding a 2nd one and feeling the same gives me some cause for pause in my thinking.
Most of the reviews I've read, both professional and owner, seem to indicate the bike handles better and has more ground clearance than the older models. I've had discussions with a couple of owners here who have gone from the ST1300 to the new GW and really like it (but that's not a new vs old GW comparision like your comments).
On the other hand I also know of a couple of new GW owners who have owned one for a while and decided to go in a different direction similar to Bee in post #26 above. Like other things in life - sometimes the more you research the more confusing it gets
At the end of the day I'm pretty happy with my ST1300ABS. My consideration of a new GW started because I am looking for a bike that is more comfortable for my wife, rides with a lot less heat, has a lower center of gravity and is common enough to easily find parts and service for the next 10 years or so. I'll go do some more digging in the Goldwing forums as Bee suggests.