You don't need to project to the heat death of the universe to get Facebook without Zuckerberg.
But you do need to project to the heat death of the universe to get high speed rail in California, which is the counterfactual worth considering since the entire system of capital is what is under criticism
There are also products that seemingly should exist but don't because no would-be inventor has found capital, eg. a decent bluetooth keyboard+trackpads with the same layout as a laptop. I know because I spent an hour trying to find one yesterday, and they basically just don't exist.