There is a quote from George Box that is used - misused actually - by many populist blogers and authors that goes like this...
All models are, some are useful
Of course this quote is used to avoid asking and answering questions around models, forecasting, and assessment of possible future states of systems, a project being a system.
The actual quote is from Science and Statistics, George E. P. Box, Journal of the American Statistical Association, December 1976, pp. 791-799.
But how simple? That's always the challenge.
The nonsense that #NoEstimates is the answer is of cource just as foolish as overparameterized and overelaborated models. This of course is lost on both sides of the modeling discussion.