Mostly i believe its that the writers envisioned and were able to wrldbuildinsucha way that the tech was not a subject but was rather a part of the scenery/background with the main object being the people and their relationships. Additionally in some cases where alien tech was interfaced with the characters inthe storysome UI/code rewites were written in, for example in DS9 where the Cardassian interfaces/AI are frustrating to Chief O'Brien and his efforts to remedy/upgrade such gets a recurring role in the story.

Conversly recent versions have taken the view of foregrounding tech aidied with flashy CGI to handwave through a lot.Basically using it as a plot device when the writing is weak.