Gopher never really went away. A few enthusiasts were keeping it alive. Those enthusiasts realized that Gopher had a number of shortcomings, so Gemini was created to address those shortcomings. It was not created to address the shortcomings of the web. (At least not directly. Indirectly one could argue those enthusiasts kept Gopher alive due to the shortcomings of the web.)
As for styling and inline images: in a sense, Gemini offers styles to a limited degree. Those styles are tied to the structure of the document, while the appearance is left to the software rendering the document. Even though inline images are considered a faux pas, I seem to recall Lagrange offering that feature. Again, we are dealing with the rendering software making the decision rather than the author. Since the end user chooses and configures the rendering software, it is the end user who has control (rather than the author).