A jāmiʿ is a meaningful link supporting the coordination of two independent clauses. It may rest on resemblance, contrast, correlation, or established association. A shared word or remote resemblance by itself does not make coordination obligatory.
طَلَعَتِ الشَّمْسُ وَأَشْرَقَ الْأُفُقُ.
The sun rose, and the horizon brightened.
These are distinct but intelligibly related reports, making waṣl appropriate. If wāw would wrongly place the second statement under the same speaker, condition, or attribution, faṣl could still be required despite a conceptual connection.