It has lost a lot of usability for searches I used to do. (And, alas, since many of my examples of searches were stored in Google Chrome as form entries for the previous interface, I'll have to think for a while about what my typical searches used to look like.) How does one do usability tests on changes like this?

AFTER EDIT: Thanks for the comment posted previously that points out that I can, for the moment, use HNSearch

https://www.hnsearch.com/

to find threads the way I'm used to finding them.