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Pascal's Law (P=F/A) is in effect here. But you are thinking of (A) as constant. In reality these three things are interrelated and change in reaction to one another. (A) increases in response to higher (P) as both the piston moves out and the cylinder lines expand (not to mention the caliper body bolts, or body in a single-piece). It diffuses some of the pressure you are creating through force at the master cylinder, and results in lower overall force at the piston. You can get to the same overall force with stretchy or stiff lines, but you will have to move the lever further for the softer lines until the forces are equalized and they are able to contain the force you want exerted at the piston. The more constant (A) is, or more accurately the more constrained the change in (A) is limited to piston movement, then the more the change in (P) will relate to the change in (F) at the caliper. We want (A) to remain fixed and change very little, except at the pistons. Another way to think about it is what happens when you have a leak, or you take the top off the reservoir, etc.? Well, (A) just went to infinity and at least in the static case, (F) is arbitrarily close to zero. We want (A) to change very little except at one or two places. So it's all about constraining (A). Very high end brakes aren't just SS lines, they are also very stiff "monoblock" construction calipers to constrain changes in (A). Think about the force exerted inside the caliper: in a two piece caliper, the force is essentially stretching the bolts holding the two halves together, whereas in a monoblock it's one big piece of metal that will be much, much stiffer and resistant to stretching.

I don't think folks are actually arguing with you Leon, only trying to explain why you're wrong.😀 😛 Actually, it seems they're mostly pointing out that the reduction in sponginess resulting from ss lines is probably a noticeable and good thing overall. VFR78 raises a good question about how they might affect ABS brakes.

Sure, Pascal's law is fake news. How could I not see thus.