Can we add some nuance here? It is not like in the last few decades there has been no new knowledge generated.
Just in my own field of biology, the amount of progress we have made in understanding how cells regulate themselves (20 year ago we were still teaching DNA->RNA->PROTEINS that do stuff), how immune systems function and can be used (stem cell therapy, cancer treatments, HIV drugs) and the flow of genetic information between organisms (the advance of (whole) genome sequencing into becoming a generic tool) has been mind-boggling.
Just in my own field of biology, the amount of progress we have made in understanding how cells regulate themselves (20 year ago we were still teaching DNA->RNA->PROTEINS that do stuff), how immune systems function and can be used (stem cell therapy, cancer treatments, HIV drugs) and the flow of genetic information between organisms (the advance of (whole) genome sequencing into becoming a generic tool) has been mind-boggling.