Instrument ideation rules?

Working with conceptual tools can be messy - for example, sketching using graphite, inks or colour paints, or modelling using scrap paper, wooden sticks, and glue. It might then be tempting to let go of messy or untidy conceptual tools, and fly the idea by digital instruments letting software show the way. But, and using the metaphor of instrument flight rules, designers, unlike pilots, do not typically operate under conditions in which ideation by outside visual reference is not safe. Although software guided ideation may appeal to improvement at micro level, for the bigger picture, which is not easily quantifiable, there can be no instrument ideation rules.