NL888 Is it a run-on sentence? No. I'm happy to concede (that) that's a good point.
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NL888Is it a run-on sentence?No.
NL888That is: it is not run-on if two sentences are closely linked in logic and grammar?No, it is a matter of grammar structure, not content.
Some http://en.wikipedia.org/wiki/Linguistic_prescription exclude comma splices from the definition of a run-on sentence, but this does not imply that they consider comma splices to be acceptable.