Exactly, when that node breaks, he’ll be forced to update back to Core. Core has a monopoly which is why there is no free market choice in this ecosystem. 

Core devs are a single point of failure. If we’re honest with ourselves, they are a great blessing but also the greatest existential risk we have. 

It’s not a theoretical risk either. They messed up segwit by creating an incentive for non-financial data and now we have 4MB blocks with spam JPEGs. 

Lines of code == bugs. And even big free code (like segwit) can mess up the network dynamics. 

We need to respect the core protocol and be very very careful with changes.