I would assume that it would have to do with the rebound and compression nature they designed in the strut. Different struts have a range which they work well. IE ground control and tc kline are good from 400-800 lb spring and its resisiance on a graph is linear.
It would seem that it would be difficult to go from a strut designed for a progressive spring to a linear, due to the resistance not being correct. At least if ride quality is important.
You should be able to install a larger sway bar, which is progressive by nature. That might work for what you need. What are you attempting to do?
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