So? First of all "legacy" is not a good measure for the quality of a TV series. Or its popularity. Second, it depends on who these "people" are - different people talk about different things. Third, you can have a damn good series without philosophical ideas, or you can have a piece of fiction full of philosophy but that is terrible from all other perspectives.

For example, one of the most popular and famous TNG episodes is "Inner Light". It has basically no politics or social perspectives, and does not illustrate the effects of technology on society. However people still remember it, and mention it every time TNG is referenced.