pg_restore and shared_buffers

(PG14.10, restoring a pg_dump created from a PG 9.6.24 instance. Restores
take about 10 hours, so testing must be more thoughtful than
see-what-works.)

This 9 year old blog post from Josh Berkus recommends setting
shared_buffers to 1/2 its normal value.
https://www.databasesoup.com/2014/09/settings-for-fast-pgrestore.html

My normal shared_buffers setting is 32GB (on a 132GB VM), so dropped it
down to 16GB (with 1GB mainteance_work_mem). Swap usage is still slowly
creeping up during the COPY phase, while using --jobs=24.

I'm wondering if 16GB is still too high, since the threads don't share
anything. (Or do they???)

Any benefit in dropping shared_buffers as low as 4GB?