When starting polkadot, we verify that the workers are using the same version. However, when the worker starts up, there are a lot more check. There is also a way to kill the parent and make the operator aware that something is wrong, but this only kicks in when the worker is being used. So, as long as node is not part of the active validator set, the operator will not find out about this. Then when the validator is part of the set, they will loose out on rewards and degrade the performance of the network. So, all the possible checks should also be done at startup of the polkadot node, like the version check. If one of these checks is failing, the node should be directly stop running. So, the operator gets informed directly.