Reading books from the 20th Century, especially from the 60s and 70s, a reader gets the chance to witness how dominated by (and dependent upon) Freudianism many mid-grade intellectuals were. It feels almost desperately reductionistic and and makes writing from that time feel dated. Freudianism is the avocado green and harvest gold of writing. Same with post-structuralist lingo in the 80s and 90s. Pomoisms are the jewel-tone palette of writing.
The writing from now, though, with its comically assclenched identitarian puritanism — that is going to be the laughingstock of the future.