Well, there are many semi-metallic pads that are very "rotor friendly" then there are those that are not at all. I saw track pads that are more rotor friendly than some regular pads.I've only tried maybe 10 different pad brands over the years, but my top 3 are
1) Akebono ASP (Performance Line)
2) Raybestos EHT Element 3
3) Akebono ACT
All three of these are ceramic pads, traditionally semi-metallic pads have more bite but the trade off is brake dust,noise, and faster rotor wear. Not sure if that is still true, but that was the general consensus for years.
I see on Sienna bit of premature rotor wear (EBC Premium) with Green Stuff. On Tigun I have Brembo rotors and those Red Stuff cannot do anything to those rotors.