Even basic fidelity was not possible due to some really complex issues (excel date format) which were not documented anywhere. Look at the PDF format, it's a ve

Even basic fidelity was not possible due to some really complex issues (excel date format) which were not documented anywhere. Look at the PDF format, it's a very complex format that almost no one fully support, but the 95% of features people use are supported in a bunch of non-adobe viewers and creators. This only happened after adobe made the PDF spec open. And they still make a ton of money off Adobe Acrobat.