In UI design (I think it’s called UX now?) the interface should never distract, it must compliment the content and facilitate a better experience for the end-user. If elements of a UI go against that mantra, it’s not a good thing. For example, if the UI has some ornate designs that elicit a certain theme that fits the content, that can be a boon.
Switch what I’m saying to graphics and audio complimenting the story’s text now. Does this graphic enhance the story? Does it add to what the words are describing with additional, important information? Then the graphics are adding to the experience. It’s why a lot of those visual novels show facial expressions and body language with the characters swapping in and out as dialog is displayed. The dialog doesn’t typically describe the mood of the characters. Nor are the environments described in many cases. The graphics carry that load.
Also, as you pointed out, extra media is extra work. Is the quality of the music/graphics you’re adding consistent? If not, the game is hurt by the inclusion of it. Inconsistency can be jarring to most and takes people out of the moment.
Lastly, if you remove something, how does it affect the story? If it doesn’t change much of anything, it’s not needed. You need to be your own editor all the time, even beyond the written word.
The only benefit of purely eye-catching things is for marketing. A title graphic does the trick. Anything beyond that has to have real purpose.
Speaking about marketing, you also asked if additional media would attract more players. If it’s of high quality, of course it will. People see more ways to engage with the game, but it doesn’t guarantee the game is better for it. Sometimes a movie trailer is better than the movie it promotes. Expectations can impact a person’s enjoyment too. If your goal is to make money, then yes, media could help greatly.
In the end, there is no right or wrong answer, just your own artistic vision… balanced with reasonable editing. Don’t screw up!