This article, "Factoring is not a good benchmark to track Q-day", was posted this month by one of Cloudflare's lead post-quantum researchers specifically addressing the factoring issue.

https://bas.westerbaan.name/notes/2026/04/02/factoring.html

It doesn't say much by itself, but it has four very good links on the subject. One of these has a picture of the smallest known factor-21 circuit, which is vastly larger than that of the factor-15 circuit, and comparable to much larger numbers. Another is Scott Aaronson's article making the analogy of asking factoring small numbers as asking for a "small nuclear explosion" - if you're in 1940 and not able to make a small nuclear explosion, that doesn't mean you're much farther away from a big nuclear explosion.