You have a point. Not all practices are relevant in all disciplines of drafting. I know one person I work with goes absolutely crazy over objects not being on snap. I'm talking F9 snap... not Osnap. Again, in I & E, snap makes cadding much faster and easier (and cleaner) in many drawings, but not in all drawings. In mechanical drawings, for example, snap has almost no use ever being turned on... unless you just want to annoy yourself.