We have a similar thing here but it's only for "deleted" topics and posts, which may have benefit for future reference for moderators and administrators (e.g. assessing member violations of Terms Of Service, and the counter to that, assessing complaints made by members about moderator interpretations of the TOS).
Locked topics, by the very nature of their being locked, will drop away in time.
"Having understood name-and-form, which is a product of prolificity,
And which is the root of all malady within and without,
He is released from bondage to the root of all maladies,
That Such-like-one is truly known as 'the one who has understood'." (Snp 3.6)
"Whether I were to preach in brief, Sāriputta, or whether I were to preach in detail, Sāriputta, or whether I were to preach both in brief or in detail, Sāriputta, rare are those who understand." (A I 333, Sāriputtasutta)