Why NOT much Solidity Blockchain Jobs out there?

Just a quick question , I see a lot of people claiming to teach blockchain development by teaching solidity , React and making full stack Dapps with web3. ( thats it ) Now there are other articles and stuff that you python and node.js as well to teach blockchain. But for now I am calling out the major tutorials/yTube channels etc. [ wont be taking names , am sorry ]

But when you go out in the job market. there is simply NOT enough jobs under this area.

yes there are jobs of blockchain dev, but then they have a huge part of them including Python/node.js/java.

So what should I draw out a conclusion , u simply cannot be a blockchain developer without being a full stack MERN/Python-React/Java-React. developer