I wrote a few years ago a whole post about this topic. Full-stack engineers don't exist. Man, that came with a lot of comments. Hot topic :D Soo, the bottom line is - I agree and it's nice to see I'm not the only one :)

https://medium.com/geekculture/tl-dr-full-stack-vs-half-stack-why-companies-are-looking-for-plumber-hairdresser-pilot-4ae75d4ed7ec

I've done it all... frontend, backend, infrastructure, design, UX, testing and beyond... Yet, after 25 years, in terms of programming, I consider myself Frontend Engineer. Everything else is just relevant and helpful experience.