I am going to take a contrarian view here and say – worse than no data is multiple sources of the same data.

Therein you have killed all objectivity that the data was meant to bring. It’s now subjective. And worse still you don’t know what it favors. Suddenly everyone is showing their version of the data point, to prove their assumptions. To get data to speak your language. And to confess.

If you torture it enough, even data will succumb