Comment by antonvs

If we change "definitely don't work" to "have the following so far insurmountable challenges", it addresses cases like this. Hardware scaling limitations on neural networks have been known to be a limitation for a long time - Minsky and Papert touched in this in Perceptrons in 1969.

The Hall would then end up containing a spectrum ranging from useless ideas to hard problems. Distinguishing between the two based on documented challenges would likely be possible in many cases.