My guess is that the author is comparing the rate of change from 1971-1996 to 1996-2021 (25 years each), but didn't do a good job with explaining that. In whic

My guess is that the author is comparing the rate of change from 1971-1996 to 1996-2021 (25 years each), but didn't do a good job with explaining that. In which case software has "stalled" in terms of "invent anything fundamentally new " - and I'd agree.