Why should the course not say that all disliked prayer locations are physically impure?

Disliked Acts in Prayer, Part 2: Places, Distractions, Images, and Remaining Cases

• Because the list includes legally different issues such as another person's land without permission as well as places near actual impurity.
• Because impurity never affects prayer.
• Because roadways are always pure by definition.
• Because place has no legal relevance.