it takes the strain off your back when turning the soil
they do make digging a lot easier if the ground is wetter
The reason we started discussing what appears to be a silly implement for the job described is the idea that fork digging in wet ground is easier than spade digging. I don't understand that concept, the work is as hard as the weight of soil you lift with each cycle rather than the tool you use to lift it with (unless you use this fork of course!). I don't know how anybody else digs but I have described my method before so today I've added a couple of photographs. I use a line to mark out 1' trenches (easy for me as I put chalk marks on my concrete paths) and dig a vertical slot along the line. I then dig over at right angles to the line so I can dig as little or as much as the soil and my condition allows. I use an ordinary spade for the vertical and a long handled one for the digging but that's just what I find easiest. Don't tell me my soil is still too wet, needs must!