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And yet all 3 of my MTBs have 68mm BB shells.
Your quote from Park is only in the press fit section, so not relevant to the discussion of threaded BB shells.
I don't want dodgy claims, I want properly audited production quantities if you're going to claim that the majority of MTBs with BSC threaded BB shells have been 73mm rather than 68mm.
gbj_tester
PhilDAS
https://www.parktool.com/blog/repair-help/bottom-bracket-standards-and-terminology
https://wheelsmfg.com/bb-standards