When I was using Vue (doesn't matter which framework) for Frontend I didn't understand this weird folder structure, I didn't understand how these files are served and how they are built and when I started learning Nuxt which is for Vue Server-Side Rendering, It was weirder for me like how SSR Works, how routes are being generated automatically and how middleware works and this when I decided to learn Node and the reason why I picked node wasn't to understand frontend stuff but to be a Full-stack developer and I was confused what to choose PHP and Laravel or Node and Express and thanks god I chose Node not because Node is better than PHP or this stuff but because I was so Lazy to learn a new language (PHP) and I didn't know that I am so lucky.
Now, I know how NPM Scripts, task runners, and building tools work and I know how to solve problems or bugs that I face in the Frontend part easily or at least much easier than before.
Something else if you are only a Frontend developer learning Node and Express will give you some knowledge about how the backend works and don't worry they are not hard to learn.
Also, Cloud Functions (serverless) will be easy for you when you learn node, and don't tell me why cloud functions are Important for Frontend Developers as every single Frontend developer I know knows about cloud functions.
Even if you don't want to be a Full-stack developer or you are but you don't know Node.js then I think you should learn Node and Express or even take some crash courses for the reasons I wrote above.
I hope you enjoyed this tiny article and this is article is about my thoughts and should doesn't mean must :-)