No question, the need for Architects and Structural Engineers are a definite needed and useful profession.
But, most any experienced “Layout Surveyor” will confirm that those trying to set construction lines from typical Architect drawings, find needed dimensions missing. In many cases, this is also true of a drawings made by engineering disciplines. Most usually will get terribly up set when a Surveyor asks for a them to dimension the missing segments on their drawing. (Personally, have never had a "Civil PE" hesitate to make the appropriate editing.)
A surveyor using a scale in the field, becomes directly responsible for the scaled distance being correct, without having a way to prove the scaled measurement is correct, or even if the drawing itself was accurately proportioned originally.
Referencing the “Ownership” question, an Inventor always has a problem relinquishing ownership of an original idea.
Many “ideas” never get off the ground because a new original idea needs to be professionally drawn on paper for actual proto-type fabrication. Preferably in a structural sound arrangement, of materials correctly dimensioned by an Engineer that was hired to do the work.
At 74th year working on IR-One2 PhD from UHK - - -