If you could get things done without any framework, that's definitely 100x better than with framework. Your code is lighter without the framework code. Framework should only be a tool to get things done easily. You don't have to do it just because it's "good". Although, if you think your site is going to be faster if you rebuild it with a framework, then it makes sense. But for a portfolio, I don't think anyone's gonna notice if it was built with React/Vue/Vanilla. But if you're curious to learn the framework, then go for it. I learnt a lot of things in React and Gatsby by experimenting things in my portfolio.
Of course employers notice when a candidate's portfolio is made with React, Vue or any other framework. It's the first thing they look at. At least for a frontend position.
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If you could get things done without any framework, that's definitely 100x better than with framework. Your code is lighter without the framework code. Framework should only be a tool to get things done easily. You don't have to do it just because it's "good". Although, if you think your site is going to be faster if you rebuild it with a framework, then it makes sense. But for a portfolio, I don't think anyone's gonna notice if it was built with React/Vue/Vanilla. But if you're curious to learn the framework, then go for it. I learnt a lot of things in React and Gatsby by experimenting things in my portfolio.
Of course employers notice when a candidate's portfolio is made with React, Vue or any other framework. It's the first thing they look at. At least for a frontend position.