I’ve always assumed the warp factor recalibration was a result of someone not liking the warp numbers going bigger and bigger and thus limiting the max to 10, therefore the recalibration being an out of universe event. I have never stopped to think whether this was ALSO an in universe event in which the way the Federation itself measures warp changes and therefore this is something more akin to the US moving to SI units for example.
Is the warp factor recalibration in Star Trek an in universe event or is it an entirely out of universe event?