I agree with you that production value replaced plot, likewise most of my favorite Sci-Fis are from the 70s and 80s.
That's because of the market needs of cinema productions to appeal to a wider and "easier" audience, in order to have a guarantied return of investment.
As a result do TV and streaming productions often offer much better plots nowadays.
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery
<code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>