Two clauses may be structurally capable of coordination without having an appropriate unifying relationship (الجهة الجامعة). Binding unrelated statements with wāw suggests a commonality the speaker may not intend.
Coordination is meaningful where both statements complete the same topic or develop related characteristics. Without such a relationship, a listener may wonder why the judgments have been presented as partners in one construction.
The decision therefore proceeds from the purpose of the discourse to the appropriate syntax—not from identical sentence shapes directly to an automatic conjunction.