I'm using DesignSpark to lay out a PC board, and am getting lots of "drill back off" errors during DRC (Design Rule Check). I understand from the web the theory behind these warnings, but wanted to ask whether a fabrication house generally will back off traces in that manner. Seems to me that a manufacturer should be able to provide WYSIWYG (what you see is what you get) traces to match the Gerber plots. Is this just a deprecated check from old days when there was a human that needed to see an actual lack of copper to know where to drill? I'm assuming that any board house is going to have a machine do the drilling, using the NC Excellon file.
I also notice that other tools such as KiCAD don't even seem to perform this check.
I also notice that other tools such as KiCAD don't even seem to perform this check.