Hi Alexey,
Thanks for your response. I would say use this approach where you have more complex components like sliders, cards, animated headers, styled component buttons( for example when your organization has brand colors etc) , this way when you deal with multiple projects, you don't have to re-write the whole component but, extend them in the respective project. Basic MUI components like button, or Textfield can be imported directly it doesn’t need to go via storybook.
In my organization, the storybook helped us a lot where the UI/UX team could review the components (in dark and light mode, various device layouts etc )before we place them in an actual project.