I think it's a mistake to have rules about filings. Maybe it's distracting, but if the filing has been done, there should be no reason for the court not to read it and make a decision based on the text. Procedure or order can't be more important than deciding cases.
It's also worth noting that the local rules for just about every court prescribe document formatting - so it's not like any of this should come as a surprise to the attorney.
Putting this another way: If a professor tells you to submit an essay in 12 pt Times New Roman, and you turn it in using 16 pt Comic Sans - it's entirely within the professor's right to say the formatting is so distracting that it makes their job difficult and ask you to print out a revised version before they'll grade it.