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Change #1138994 had a related patch set uploaded (by Abijeet Patro; author: Abijeet Patro):

[mediawiki/extensions/ContentTranslation@master] mtValidator: Use MT thresholds from configuration

https://gerrit.wikimedia.org/r/1138994

We have very low thresholds (45%) for some wikis (https://gerrit.wikimedia.org/g/operations/mediawiki-config/+/90a6a0078df260d951bcbfdb28642bc2070f63b6/wmf-config/InitialiseSettings.php#8235). In such cases it might not make sense to warn users for 35% threshold. Maybe in these cases we just don't have a warning at all and just an error?

The 45% thresholds are extreme case. It means you cannot publish a translation that has >45% machine translation. This demands heavy editing from translator. We also don't tell the translator about these percentages(T251887).
In my opinition, a simpler, consistant and predictable threshold level is better. If T is threshold for errors, make T-10 as the warning threshold, irrespective of value of T.

Change #1138994 merged by jenkins-bot:

[mediawiki/extensions/ContentTranslation@master] mtValidator: Use MT thresholds from configuration

https://gerrit.wikimedia.org/r/1138994

Change #1141940 had a related patch set uploaded (by Eamedina; author: Eamedina):

[mediawiki/extensions/ContentTranslation@master] CX3 Build 1.0.0+20250505

https://gerrit.wikimedia.org/r/1141940

Change #1141940 merged by jenkins-bot:

[mediawiki/extensions/ContentTranslation@master] CX3 Build 1.0.0+20250505

https://gerrit.wikimedia.org/r/1141940

Appears to be working as expected.

Screenshot from Assamese Wikipedia where the MT limit is 80%, warning appears till 70%