Newer airports seldom (or none) built intersecting runways which crisscross each other.
AFAIK, if 1 is active, the other one has to be deactivated for t/o and landing. So it's just as bad as having only 1 active runway.
It's mainly economics - if you can justify building a new airport/runway you will want to get the maximum return from the investment. Crossing runways can be operated at the same time - there are plenty of well established procedures that ensure separation of movements (and a few iffy ones like LAHSO/HIRO) but all are 'dependent', i.e. some things cannot be permitted while aircraft are in certain positions or relative positions. This means that you always lose some capacity when compared to two runways that can be operated independently, i.e. without having to worry about what's going on on the other runway. To get independent operations the runways have to be a specific distance apart - offset thresholds and parallel is the optimum for most types of operations (can't remember all the distances offhand).