I suspect they bring it up so often because like the Ussherite “fundamentalists” who firmly “believe” in the 6000 year age of the earth they firmly “believe” that main stream science of our period of time has figured out when, and now only need millions of more years to go figure how “nature” or “God” did it from a common ancestor. And so they can’t tolerate ANY competition.
Also pride enters the picture: modernist theologians and friends think they are so much smarter than the Bible thumpers that they are attempting to stamp out the religious belief of a young earth to the point where their scientism will not be impeded by any opposing religious belief.
Somewhere in between the above
religious beliefs may be the answer but needs the light of day to progress. ID with Professor Michael Behe et al. was a start but notice how quickly they got labeled as Creationists by the scientism group as expemplified by “Saint A.” But they needed ACLU.
There are several good web sites where scientists with ID report on their progress in the field of biology that confronts the evolutionary fairy tale of life from a common ancester. There are of course many evidences for a 2000 - 100,000 times younger earth than billions of years based on hard scientific data as well. It’s just hard to to get that data into the media or into University discussions due to the blackout policy of academia.