Jon you are correct in saying that just because everyone else uses it doesn't make it good (not a quote, only my interpitation), that goes for anything. I have used in my car a custom ground cam by Crower, reground stock cam, and this Schnieder that is in it now, I have not had any problems with any of them, I just move up in agressiveness in small steps. Any way back to the point, I am sure that you are right about them only having our cams because Motorsport has a contract of some sort with them and they probably would not even make a cam for L series engines otherwise.
Now that I am thinking more about it my mind is sending me off on a tangent here. When I was younger Schnieder and Lunati were the cams to have but these things were always built for pushrod engines, it could stand to reason that the metallurgy from pushrod to overhead would be different and maybe they never saw any need to change what has always worked for them. I am defending them because I have that cam and have not had a problem with it... but if I do have any problems I can assure you I would find out if it were a problem with the cam or something else then I would let everyone know.