With inline styles you can’t do media queries (e.g., so your site can look good on both phones and desktops) or pseudo selectors (e.g. :hover).
Also, though it’s lower-level than something like bootstrap, it does have a design system. Bootstrap is like building a model from a kit, plain css is like building a model from scratch, and tailwindcss is like building a model from lego.
Also, though it’s lower-level than something like bootstrap, it does have a design system. Bootstrap is like building a model from a kit, plain css is like building a model from scratch, and tailwindcss is like building a model from lego.