I agree with you – my comment was solely about TOS.
In addition to ENT S3, we could also cite large chunks of DS9 and Voyager, and even TNG but to a much lesser extent.
But TOS is about as close as you can get to a purely episodic show. It had one two-parter and very few callbacks. Even now as a life-long Trek fan, with a few exceptions I can’t tell you where any given TOS episode sits in relation to the rest.
