Buttons and Doodads? sigh.
A significant factor as to why Apple has succeeded the past 2 decades is due to the design of their products - from the sleek aluminum bodies of their hardware to the UI/UX of their operating systems.
Unless you want your UI to look like something out of 1995, you're going to have to make it look good.
Making it look good will require a decent amount of code.
From animation libraries like Framer Motion, or data visualizations using d3, or even After Effects renders from Lottie.
That isn't even mentioning the amount of state that is required to be stored so that proper renders could occur - If your user has logged in, if your user has typed something into an input field, how many times you should retry a request if it fails, what functions to run due to a websocket response, and myriads of other things that FE engineers have to deal with.
Please reconsider your thoughts.