Well, first off, there is a bit of truth in what he is saying.... It is very difficult to use PURE and ABSOLUTE ground coordinates.
On the other hand, what we call "Ground" is usually (there are exceptions) quasi or average ground coordinates.
That is, we take an average of our project, and make a combined scale factor, (Like +110PPM) and call that ground.
Since that is a common mechanism, then the next issue that comes up, is WHERE the coordinates are going to get scaled.
PERSONALLY, I like them scaled in the LS. OTHERS do it in the Surveying software, such as Carlson.
I usually set page 0 to real grid coordinates.
And, page one, is my local ground, often named "Evans @ 96 PPM"
This way, I can "Pretend" that it is all ground. And, IF I have a SPC coord, that I need, I can make Page 0 active, and key in a SPC coord.
At the end of my project, (After going back and forth 5 times, Coords in, coords out, etc) I can archive pure SPC.
So, in the end, I have both, and I don't have to monkey with it as much.
That's just my flow chart. I think it is simpler. This way, I can also take my line work into the LS, on the same scale as the drawing.
WHERE they get scaled, is not a primary concern. What is a primary concern, is that you know what you are doing, and that you can go back and forth, fluently.
I have dreamed of a office suite, that labels the lines, and does all the descriptions, with a scale factor. And, can annotate rotated. So that you can set a job on pure SPC, underlying. And the final product simply comes out on ground, with any basis of bearing you like. But, that is another subject.
Nate