I was noticing the same. People just standing around an engine idling while the cam is supposed to be getting broken in. I kept my RPM moving all through break-in like my machinist and you both told me. "don't let it drop below 2500".
I bought Summit lifters and cam and lubed em all up and have about 3k miles on my motor and haven't had any problems with 'em at all. I also used Comp break in additive for break in,changed it and added more camp additive then ran it 1,000 miles about and changed it again and added more additive. As per being advised, your engine needs lots of ZDDP and most oils nowadays have a horrendous additive package for even new motors.