I apparently still missed one:

A database error has occurred. Did you forget to run maintenance/update.php after upgrading? See: https://www.mediawiki.org/wiki/Manual:Upgrading#Run_the_update_script
Query: SELECT tmi_value FROM translate_messageindex WHERE tmi_key = '-1:version' LIMIT 1
Function: DatabaseMessageIndex::get
Error: 1146 Table 'brwikimedia.translate_messageindex' doesn't exist (10.64.0.7)

Only 7 files are relevant for WMF, which would be the only user of this combined file.

revtag.sql
translate_groupstats.sql
translate_metadata.sql
translate_sections.sql
translate_groupreviews.sql
translate_messageindex.sql
translate_reviews.sql

Separate file can easily get out of date.

(In reply to comment #2)

Only 7 files are relevant for WMF, which would be the only user of this
combined file.

revtag.sql
translate_groupstats.sql
translate_metadata.sql
translate_sections.sql
translate_groupreviews.sql
translate_messageindex.sql
translate_reviews.sql

Separate file can easily get out of date.

Maybe, but if you edit one, you edit both..

And you could use that as the default/first file in schema updates

Other than that, it might be worth creating a small script in WikimediaMaintenance (Probably better than translate itself?) to create all the tables on a specific wiki when provided with a dbname?

Could just be done in bash with mwscript, or as a more "proper" MediaWiki maintenance script

https://gerrit.wikimedia.org/r/#/c/45797/