Compared to the previous 70 years, the last 70 years of scientific and technological research has been complete and utter shit, except for lithography. Pretty simple, really. The presence of all that cheap labor in the last 70 years has objectively not made things better. Mind you, in raw numbers we have at least 10x the number of active workers in the sciences in the last 70 years as in the previous 70 years; and less is getting done. Imagine that!

Your first point is a red herring: the presence of cheap labor in the sciences and the lack of decent jobs makes it unattractive to any sane person who was born in a first world country.