Earlier quoted context omitted.
I think it is a lot about under-performers that want to hang onto their "years of experience" as a selling point and being angry that there is not much of a market for "years of experience" only. Maybe they were not under-performers 10-15 or 20 years ago, but if someone gives 20 pages of resume and most of it happened in 90's I would not be interested. Because it is quite easy to see such person is hanging onto his p…
So my resume concentrates on the last five years, with the prior 30+ being mere bullet items, in the event you want to ask. You are correct that no one really cares about what you have done outside the last five years.
But then under performers are interviewing more so they cast bad impression on others that are their age/ethnicity whatever.
Just like the saying good developers are not on the market for long and one that make good impression are hired quickly.