In theory this is meant to be a good thing because it allows for competition between train operators which sounds like it should lead to better outcomes for cus

In theory this is meant to be a good thing because it allows for competition between train operators which sounds like it should lead to better outcomes for customers. There's also a desire for companies to be able to operate commercial trains that don't have government backing on an equal footing with the government-chosen operators, which only works if the other train operators also have an arms-length commercial relationship with the track owner and operator. Also, you need to bear in mind that European governments benefit from the other governments strictly following this rule because it means their train operators can run trains in those other countries, but are often less keen on doing so themselves. So there's an interesting dynamic where a lot of countries insist that of course they're following the rules, it's all the other European countries that are unfairly bending them to benefit their train operators.