that's because you have no evidence that changing the switch time will balance the countries. the only one that has it is hitech.
semp
Sometimes all it takes is 2-3 good players to switch to completely change the direction of the fight. If a good player can switch and help slow down a hoard, it can even out the balance of the fight. In reality there really should not be that lopsided of #s if the map promoted action in all 4 quadrants.
Another issue is that, if you switch teams, furball, and change the direction of the fight for your team, then your team becomes the hoard, you are now stuck on that side for the next 4-5 hours. If it goes into off hours and the #s shrink, you will not be able to switch to the team that needs the most help. This is just a hypothetical. But when the #s get below 50 in the map, the map needs to change to a smalle one, or the switch time needs to be disabled.