That goes both ways. The problem of being an expert on the F-35 is that you can't warn friendly nations of the critical problems classified as confidential.

"The number of major F-35 flaws is shrinking, but the Pentagon is keeping details of the problems under wraps" - https://www.defensenews.com/smr/hidden-troubles-f35/2021/07/...

"“Details of [deficiencies] — even unclassified [deficiencies] — are not publicly releasable because the information is operationally sensitive, and its release could be detrimental to U.S. and international war fighters operating F-35s worldwide,”... Seal noted that all remaining critical deficiencies are classified as category 1B issues, which represent a “critical impact on mission readiness.” The more serious category 1A problems indicate a risk to the operator’s life..."

"...In June 2019, Defense News published an investigation into the F-35 that detailed all 13 category 1 deficiencies on the books at the time — the first and only time a full list of F-35 critical deficiencies has been publicly released."

Since Finland selection was done way before, how many of these were disclosed to them?