In most businesses, self-proclaimed full-stack teams are usually more back-end leaning as historically the need to use JS more extensively has imposed itself on back-end-only teams (that used to handle some basic HTML/CSS/JS/bootstrap on the side). This is something I witnessed over the years in 4 projects.

Back-end developers looking for a good JS framework will inevitably land on the triad of Vue, React and Angular, elegant solutions for SPA's. These frameworks are way more permissive than traditional back-end MVC frameworks (Dotnet core, Symfony, Spring boot), meaning it is easy to get something that looks like it's working even when it is not "right" (=idiomatic, unit-testable, maintainable).

They then use components as if they were simple HTML elements injecting the initial state via attributes (props), skip event handling and immediately add state store libraries (Vuex, Redux). They aren't aware that updating a single prop in an object with 1000 keys passed as prop will be nefarious for rendering performance. They also read something about SSR and immediately add Next.js or Nuxt.js, a custom Node express.js proxy and npm install a ton of "ecosystem" modules like webpack loaders that will become abandonware in a year.

After 6 months you get: 3 basic forms with a few fields, regressions, 2MB of JS, missing basic a11y, unmaintainable translation files & business logic scattered across components, an "outdated" stack that logs 20 deprecation notices on npm install, a component library that is hard to unit-test, validate and update, completely vendor-& version locked in and hundreds of thousands of wasted dollars.

I empathize with the back-end devs: JS frameworks should not brand themselves as "simple" or "one-size-fits-all" solutions. They should not treat their audience as if it were fully aware and able to use concepts of composition, immutability, and custom "hooks" paired with the quirks of JS, and especially WHEN they are a good fit.