I agree that we have seen more blow by's, but its related to increased volume, not decreased quality. I think his defense is ok. Not great, but not terrible either. Definitely works hard on that end as well.
I'm ironically happy that we have some clearly worse 1on1 defenders, as there is less motivation for teams to target Lauri when you can target Sexton, Keyonte or KO and likely score more. That way we avoid the problem that comes with Young, Harden, Luka or Lavine, who are just inviting you to wear them out and give back a lot of the points they score on the other end .