I went to see your old posts to get an idea of how much your puppy weighs, and saw that one! EEK!
I think that the millions put down due to behavioral issues would be put down due to behavioral issues with or without socialization during this period because of people who get a puppy and end up with a dog. And don't do much in between. Now that is just an opinion, no study to back it up!
BUT if I am responsible, active, love my dog, do the research like you are doing, I am going to do the very best for them after they clear their shots to do socialization and won't lose much if my dog has a good temperament to begin with. So if the puppy is healthy, good immune system, has had good care, I would take them and carry them places. Especially if not worried about aggressive dogs coming around-I would walk around parking lots, up and down Main street, in front of stores, whatever, holding the puppy. Farms to see cows, go to your community college and sit outside during class change times holding a puppy (and treats for the puppy for learning people give good stuff). IF I have a shy puppy, I do it more, but in shorter bursts (minutes/seconds).
Then after the third shot (by a few days) I'd let them touch ground.
I don't think you lose out that way, and I feel safer.
I have two foster puppies-neither started healthy-so I skipped the carrying part to get their immune systems going, get their worms gone, get them thriving. Well, we obviously went to the vet office! (carried and with towels)
Now we are starting outings and exposure. They might be a little behind but I don't think dangerously so. I made sure to do a lot in and out of the house to expose them to surfaces, sounds, and let visitors meet them.
Good for you for thinking all of this out. I am generally more cautious and there are others who will add their thoughts I am sure!