Using a Machinist Tool Setter to Level a 3D Printer Bed

This video show how you can level/check the bed to nozzle height. I'm using Pronterface to send G code MDI commands to the z axis to a known value, and using a Shars machinst's tool setter ( www.shars.com/... ) to check and level the bed.
Using the X and Y jog, you lift the head to a height higher than the tool setter. You then use a G code command to send Z to the height of the tool setter (in this case 2" or 50.8 mm). Then note the height at that XY location, raise the Z up, move to the other corner and send Z the G code to go back to the tool setter height.
As I've mentioned before on various forums, it seems that the 3D print community has a bit to learn from a mature industry like machining. One is having a live DRO output on the machine.
Another is not having good backplotting software like we do in the CNC world.
The other is having tools to set up jobs so they don't suck and to verify that the machine is in alignment. Even hobbyist machinists spend a good amount of time setting up their Mills, Lathes, CNC, etc. so as to get the most accuracy possible. In the 3D printer world, it's as tho they thought that these cobbled together pieces of 80/20 rail and some cheap wheels would suffice and to set up a machine's nozzle height you just use a piece of paper.
The entire 3D printing thing seems a bit too much "man-bun, Java jockey, pitiful Python Pirate" driven. Someone needs to really make a decent machine/system on par with even a CNC hobbyist using Mach 3/4.