A verbal clause can foreground the occurrence or renewal of an act. If two distinct events are being related, matching verbal structures may be more effective than an unnecessary switch to nominal predication.
قَامَ زَيْدٌ وَقَعَدَ عَمْرٌو
Zayd stood up, and ʿAmr sat down.
Both reports narrate occurrences in the past tense. Their grammatical correspondence strengthens an already meaningful relation; it is not a substitute for the jāmiʿ.