I contacted Swift about their springs' performance with stock struts, and received this in reply. Can anybody with more technical knowledge chime in on what they think of this,
and if it's a legitimate reason why premature wear won't be noticeable? Response begins on the next line:

It is true that the springs will make the shock sit at a lower position. Shocks however do not increase in pressure as you compress the shocks, the rod pressures stay the same.
Even on an OEM suspension setup, they are compressed at static height. This is the reason why we calculate the proper rate increases needed for a specific ride height to match
the load amounts at certain stroke levels seen in being daily driven. (This is the reason why even our sports springs have an increased rate even through they are not specifically
meant for competition.)

Shaft speeds
As for what you referred to as less resistance in the shocks. (I mentioned the shocks potentially recovering from a bounce and returning to a position higher than the spring height
for a moment). Oem vehicles are almost always be slightly overdamped. Our spec r springs are built to the upper limits of the oemshock valving. This however does not mean
that the shocks are not able to handle our spring rates. In fact it's quite the opposite. We create the springs to be critically valved with the oem dampers.

Rapid compression/decompression is a very standard motion in a shock life. And remember that a shock is a dynamic mechanism while a spring has static rate.
In other words there will be no moment where the shock does not have resistance as long as their is movement. I am sure you have heard of the term "digressive shock" which is
a very marketed term in the suspension industry. Well to an extent all shocks are digressive at certain shaft speeds. This is because the shim stacks will fully open up when a
certain impact is seen. Seals in a shock are made to go through these motions.

In any given shock designed or a revalved shock for higher spring rates will not have any different seals from what any shock would use. It is the the valving forces that are changed
through the differences in the piston stack. In other words seals are made to handle high shaft speeds and will not see a difference in shock life. In fact with higher spring rates the
shaft speeds may increase but overall movement of the shock is decreased.We market our lowering springs to be designed around the useable stroke of the shock, because that's
exactly what we do. For every application we designed, we calculate how much stroke a shock has, as well as dyno them. we can calculate what kinds of forces the shock/spring
would see even in the harshest conditions. If for any reason the shock does not have stroke to lower or the shocks just do not have enough valving, we simply do not make springs
for them, and deem them not safe to be lowered. We would just recommend coilovers for those applications.


EDIT: It's a long read, but I'm thankful they took the time to write such a detailed response.