why does this matter?
It matters because large proportions of cases are filed on a Pro Se basis (where a plaintiff or defendant represents themselves). To have equal access to justice these plaintiffs or defendants need to be able to understand the law. If the laws are complex, or the language is hard to understand, then – without access to professional legal counsel – this creates a signifcant impedement to the effective implementation of the Rule of Law.
To put this into context, in the Federal District Courts, 35% of all cases are filed on a Pro Se basis (and 67% of these pro se cases are filed by prisoners). This amounts to approximately 70-80,000 cases each year.