Its all in the design of the motor, like little cars and big cars, its the power plant driving the assembly that ultimately decides performance (handling not a factor in this comparison).
Now a manufacturer will usually want to take the easiest and cheapest route to achieve its goal so they will opt for the most reasonable cost effective design for the task at hand.
A large 12 inch driver will require a reasonably simple and inexpensive motor design to achieve good low frequency response but would require a more intricate and expensive design if the same size driver was intended for high frequency response like a domed cone for better image and dispersion and proper inductance and power handling for accurate high end reproduction. As said before, large diameter mid/high drivers exist for certain application but the drivers are very expensive.
Now take a a small 2 inch driver and the same logic holds true, its cheaper and easier to build them for high frequency use, you could build intricate designs for low frequency use with long throw suspensions, multiple cone drivers and intricate enclosure designs but again the cost is a lot higher than just using a large cone on a simple motor.
All that **** said, I always liked how Eclipse subs hit, they had that nice "hit you in the chest" effect in a small sealed enclosure.
Cheers and beers.