Why do scientists not use the Greentek Gelfree S3 EEG cap to write papers on a regular basis?

Krisztián Hofstädter OpenBCI setup with the Greentek Gelfree S3 cap as shown here: This would be very interesting for meditators like us to study their brainwaves. But is this EEG cap reliable? What lets us doubt is that Krisztián Hofstädter shows in the following demo only 2 EEG channels: These are tracked with the EEG …