It seems those who have responded have unfortunately confirmed my suspicion.
Since I don't have a place to overwinter potted fig trees, and because long term maximization of fruit production is my goal, I will be planting all trees in the ground the year after rooting.
I now have 3 trees that are finally producing fruit.
It took 4 years for each of them to produce more than a handfull of figs each.
By the end of this year I will have planted an additional 8 trees in the ground which will average 5 to 6 feet tall, but next year, the first 3 trees I planted 4 years ago is all the figs I can expect.
I was mislead into thinking it only took a year or two for trees to begin fruiting because I saw so many videos showing potted fig trees less than 5 feet tall with lots of figs. But it seems to me now that, at least for the 5 varieties I'm growing, the trees planted in ground, if left to grow vertically, need to attain a height of eight feet plus to produce a significant crop.
And back to pruning, an older tree, say 8 years old or older, can probably be pruned heavily and increase fruit production. But trimming off even a foot from 4 years old trees can delay fruit production another year.
So if the fig trees are to be grown in ground and upright, even if the goal is to have trees that are not too tall to make harvesting easier, the best approach to getting a significant harvest as early as possible is to let the trees grow as large and tall as they can so fruit production comes early, but then, after the trees are 8 years or so older, then cut them back, and hope fruit production doesn't stop as it does when trimming 4 year old trees planted in ground.
For now, at least, that's how I assess the experience of my 4 and a half year long concentrated effort to create a meaningful amount of food supply from fig trees.