Every tried working at a desk or worktop where after 10 minutes your back is killing you because you're being forced to bend because of its height.
No! To be honest I've always found each and every desk and worktop has been designed perfectly to fit my body metrics.
I've taught a lot of people to dig over the years including many much taller than Vortex. The hardest part is getting through that height is not an issue. Health and fitness is, along with technique. My latest apprentice I've been lumbered with is only 7 and he pretty much got the hang of it in less than 10 Min's after I got through to him that he's too little to lift a full cube and has to cut tiles instead.
The work surface for digging is the soil we stand on and this is fixed at the perfect height by its creator. Distance does not come into it, just angles of bend and the angle a short person bends is the same as a tall person. Unless the person is one of life's unfortunates with arms too short to reach trouser pockets. (I won't teach those 'cause they can never find their money) :(
Method and fitness. If anyone is completely unable to bend so far that they cannot reach their ankles it is hardly the fault of the spade.
I tell you - "You are doing it all wrong".
(Wait till Eristic2 joins us) 8)