That’s not what a distributed system is. I think OP was talking about distributed systems in the computer science sense, and the theory around it, e.g. lamport

That’s not what a distributed system is. I think OP was talking about distributed systems in the computer science sense, and the theory around it, e.g. lamport clocks, distributed synchronization mechanisms... You could argue that blockchains are also distributed systems, but only in a very limited sense. To OP: I think it’s absolutely worth it. Any car is a distributed system, even smartphones (by themselves, not just as part of a network!) have so many independent devices with full-blown CPU cores in them that you can call them distributed systems, and as you probably know by now, it’s absolutely a non-trivial topic. So if it’s something that deeply interests you, there is a market. Given your full stack background (by which I assume you mean web development?), you might first need to look for work on distributed systems that are strongly associated with the web, web services etc.