Good points.
The worries for someone that is going to suffer an early freeze such as described is that it can damage roots enough to stop growing, leaving the growers little ability to keep growing There are different methods depending on the fear.
The process for fruit trees is different. They are perennials, deep rooted and always go through heavy winters. The process you are describing is to save an early blossom or first growth.
The process that I describe is to be able to keep growing the buds minimizing the risk of cold air entering air space in the soil, possibly frosting surface feeder roots. The idea of applying water to buds scares me. Here is a good article that describes in detail the full recommendations for this method. Important to understand the real details.
Will It Kill Plants to Water Them Before a Freezing Night? | Home Guides | SF Gate
https://homeguides.sfgate.com/kill-plants-water-before-freezing-night-68746.html
I've heard of the process your talking about, and it probably has its place with some crops. Myself I would not want the extra water, but a lighter watering might work I guess to help with closing air gaps.
The foliage loss ideally would be addressed when temps are freezing or below, a frost cloth tent or roof setup if possible with hoops would be my first choice if outside and not acres worth.
If it's only hitting 31-32 degrees you'll probably be fine with soil watering and no foliage protection, maybe 30 degrees.
If your going to hit 28 degrees without cover I would bet that watering the roots will not save the plant from foliage losses. My example of the peach tree blossoms being saved with overnight sprinklers just shows how delicate tissue can be saved at lower temps.
It would not be my first choice in protection though, lots of branch breakage likely, the extra water on the flowers not ideal.