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Why are we only able to select a pre-written bullet list without being able to comment when there is a dispute about a review? I literally looked up whether run-on sentence commas are objective errors or not.

Yes, run-on sentences are considered objective grammar errors because they occur when two or more independent clauses are joined together incorrectly, without proper punctuation or conjunctions, creating a sentence that is grammatically incorrect and can be confusing to read; this is a clear violation of standard grammatical rules.
Key points about run-on sentences:
Definition:
A run-on sentence is when two or more complete thoughts (independent clauses) are written together without the necessary punctuation or coordinating conjunction to separate them properly.
Objective error:
Since there is a clear grammatical rule about how to connect independent clauses, a run-on sentence is considered an objective error that can be identified and corrected based on established grammar guidelines.

Here is Scott's official take on run-on sentences:

"However, some style guides allow for the comma to be omitted if the two independent clauses are "very short". Because there is subjectivity in what qualifies as "very short", I recommend never mark the omission of this particular comma (one before a coordinating conjunction connecting two independent clauses) as an objective error, even if the sentences seem long. What is short, medium, or long can be subjective."

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