Procedure or order can't be more important than deciding cases.
What is the act of deciding cases if not a carefully constructed procedure meant to keep order? What is the harm of telling a lawyer to try again, this time following the rules?
In Swedish courts the court evaluates evidence as it likes. If the judges and sort-of-half-judge-half-jury-Nämdemän agree that something can be concluded, then they're allowed to conclude that.
Obviously procedure is useful, but hearing the complaint is more important.
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.
If anything, it scans like the court is concerned, like you are, that this vulnerable person’s case isn’t being presented with the seriousness it deserves.
If it is a serious matter you deal with what you have.