I wonder if any piano techs actually use the Baldwin accujust rear hitch pins to adjust the string down-bearing on the bridge? Probably not many.
But it is a unique design Baldwin can claim as its own, I suppose...
Yes. Particularly in the bass where they effectively lengthen the backscale. Just how much depends on the specifics of the design.
I'm not a fan of the original "spring" style of pin, however. I much prefer solid steel pins. My pin of choice is the Driv-Lok Type H solid stainless steel pin.
The marketing reason given by Baldwin was that the vertical hitchpins allowed the factory workers to more precisely adjust the amount of string bearing against the bridge after the piano was strung. This was true but the real reason for introducing them was more production related. It allowed the company to mark, drill, notch and pin the bridges by machine before they were glued to the soundboard thus saving quite a lot of time while, in theory, still allow for precisely adjusting string bearing.
It was a good idea, but like many good ideas, it introduced some problems. It allowed the workers to get really sloppy when setting the height of the string frame. Vertical hitchpins work very well when the strings are kept low on the pin. I don't remember the original specification but I don't like the strings to be more than 4 to 5 mm off the surface. Preferably 3 to 4 mm. I've seen them as much as 12 - 15 mm off the surface in new Baldwins.
In the treble (especially) if the strings are too high there can be significant energy losses. It can also be a little tough on the casting. Baldwin increased the thickness of the casting through the hitchpin area.