They basically never need 95% of it and most of it is never looked at again.
That 5% that does gets used ends up been collapsed to a single 100,000ft view somewhere that the decision makers in the company can see it and immediately treat as gospel.
Which is fun when you are the new hire, get asked to look at that dashboard and it turns out it's not calculating the totals correctly at all.
Then you have all the people in that business who collate reports for more senior report readers who never look at them but still collate them and those more senior report readers never pass it up anyway.
Enterprise is a serious weird kafakaesque place at times, it helps to just ignore the weirdness since you can't change it.
In some countries there's a SCAM in which the owner or agency lowers the mileage of the car and sell it for much more because of the lower mileage.