Kickstands "designed for steel frame"
It's easy to design a rear kickstand for a standard steel bicycle since all you need is a strong clamp on one of the chainstays.

For carbon, the clamping mechanism has to be designed carefully because it can neither compress the stays too much (carbon is fragile in compression) nor can it scratch the carbon too deeply (if the fibers fray, the whole structure weakens).

Aluminium is in between. The main concern with alu is that the stand can crimp or bend the chain stays if the bolts are clamped on too tight, or if there's too much of a load on the bike (full panniers) and all that stress and force is concentrated in one area.

If your bike is both expensive and made of either alu/carbon fiber, I'd either forgo using a rear kickstand, use track stands, or use center-stands that use the bridge between the rear chainstays and bottom bracket for support.