Unlike some I do not consider this function wanky, ricey, or any other name people would like to call it.
Wether the push button method is referred to as "scramble boost" or a "high/low boost switch" is irrelevant; I remember seeing a Jap DVD and while reviewing a race car, they referred to this button as "scrambled boost".
Consider having a 300+rwkw, 2WD car, making a shit load of torque and power at lowish rpm, then using this car as a "club day circuit car". Running 20psi exiting a corner is going to be a recipe for wheel spin and eventually it is going to catch you out, resulting in a very expensive repair bill. So it makes sense to have "low" boost set at 14psi to limit power while exiting a corner, then once on a straight, press and hold a button to get full power (20psi).