Dedicated gates are much less common in Europe than it is in the US; slot-limited airports tend to much more be about runway slots than they are about gate capa

Dedicated gates are much less common in Europe than it is in the US; slot-limited airports tend to much more be about runway slots than they are about gate capacity, and increasingly many airports in Europe are limited by runway capacity with little (politically) realistic chance of expansion. But yes, fundamentally it's a case of the cost of operation being lower than the risk posed by new airlines.