Writing an OS is not any harder than writing a database or a programming language. The complexity lies in how far do you want to go with it.
While not black-magic, dealing with hardware and its quirks is a different skillset than writing React logic. A bug might need a reboot, or in some rare cases with terrible hardware, turning it into a paperweight.
In fact, I believe that learning to write low-level code for simple hardware (say, an Arduino or a RP2040), is a smoother path for a complete newbie than learning the massively complex frontend world, and provides much better foundational knowledge.
While not black-magic, dealing with hardware and its quirks is a different skillset than writing React logic. A bug might need a reboot, or in some rare cases with terrible hardware, turning it into a paperweight.
In fact, I believe that learning to write low-level code for simple hardware (say, an Arduino or a RP2040), is a smoother path for a complete newbie than learning the massively complex frontend world, and provides much better foundational knowledge.