Unfortunately, not all data held by an organisation is generated and held in a publishable format.

The data in this example is created incidentally within email chains as part of a broader process.

It's really not cost effective to publish real-time data that's been requested by these firms.

So in principle, I agree that where there is substantial data held that the public are interested in, it should be published. However, it's not feasible or cost effective to publish all data or records held by a public organisation.