A lot of "serious" tech skills is either cargo-cults building engineering playgrounds to benefit their own career - they are truly only necessary in very narrow cases you're unlikely to see unless you operate at actual FAANG scale (VC-funded FAANG wannabe doesn't count).
If your intent is to work at FAANG or a FAANG wannabe building engineering playgrounds then fair enough, these skills would be useful, however if you want to learn to solve your own problems keep in mind that most of the cargo culting is not necessary; I suggest you learn solutions as you encounter actual problems and it's fine for these solutions to be old-school and "uncool" such as Rails/Django or God forbid, PHP.
A lot of "serious" tech skills is either cargo-cults building engineering playgrounds to benefit their own career - they are truly only necessary in very narrow cases you're unlikely to see unless you operate at actual FAANG scale (VC-funded FAANG wannabe doesn't count).
If your intent is to work at FAANG or a FAANG wannabe building engineering playgrounds then fair enough, these skills would be useful, however if you want to learn to solve your own problems keep in mind that most of the cargo culting is not necessary; I suggest you learn solutions as you encounter actual problems and it's fine for these solutions to be old-school and "uncool" such as Rails/Django or God forbid, PHP.