«لَا إِفَادَةَ وُقُوعِهِ مُطْلَقًا»
The goal is not merely to report the action's occurrence in an unrestricted way.
When an object is specified, the speaker may wish to tell the listener who acts or what is affected, not just that some action happened. Conversely, an objectless transitive verb may deliberately limit the focus to the action as a characteristic of the agent.
زَيْدٌ يُعْطِي
Zayd gives; he is a giver.
In a context of praising generosity, the sentence need not answer “What does he give?” It characterizes Zayd through giving.