A CSS framework can provide shared design rules and reusable styling patterns. It can save work when those patterns fit your project. It also adds conventions, configuration and an update responsibility.
The useful parts
A common spacing scale and typography system can reduce small inconsistencies. Layout utilities can make familiar patterns quicker to express. A component-oriented framework can supply a starting design and selected interactive behaviors; a utility framework such as Tailwind requires you to compose those parts yourself.
Documentation is useful when the team follows the same version and conventions. It is less useful when examples are copied from a different major version without checking the generated result.
What it does not guarantee
A framework cannot guarantee cross-browser behavior, accessible controls or good performance. Its supported browsers set a starting boundary; your content, component choices and custom styles still need testing. Predefined breakpoints do not prove that your layout works between them.
An evaluation exercise
Choose one repeated component, such as a labeled form. Write down the fields, validation, keyboard behavior and visual requirements first. Implement it with native CSS, then with the proposed framework. Compare maintainability and the actual shipped output, not just the number of lines in the HTML.
Keep the simpler choice when a framework adds more setup than it removes. If it helps, document its version and theme choices and plan updates deliberately. See Tailwind versus Bootstrap, the Tailwind setup guide, and the forms path.
Sources
Reference 1 Reference 2 provide the technical details and current compatibility information.