Many articles tackling the issue of CSS frameworks either argue whether or not they should be used in a project at all, or dig deep on the pitfalls...
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Some sites have a very bootstrap feel to them, which is fine as they are often clean and easy to use, but they just look very similar to other sites and not very unique.
I like using Bulma as a css framework as it is extremely customisable by altering a few sass variables, but also has great components you can start building from. It’s also very modular so if you wanted to, you could choose just the bits you want to include to give you more freedom and creativity on the rest.
Sites getting locked too deep into what the framework allows are part of why I'm a fan of Atomic CSS, since it's much easier to use as an empowering utility instead of something with limits ingrained into it. Great topic to focus on and spread the word about!