408 hyd roller, too much spring pressure?

^^^^ Read post #64. BHs do not require lighter valves more than other type of spring. Of course, one would use the lightest valves & valvetrain possible in the interest of VT stability & VT life; only a fool would use parts heavier than necessary.

Production vehicles have multi year warranties. The fact that OEMs use BHs while warrantee-ing their engines for 3-5 yrs speaks volumes about BH reliability.

Isky said it best in Tech Tip: Is extra exh duration necessary? Habit, he said.
I think it is the same here. Folks get into a habit, & will not accept new technology. Some are probably using crank handles to start their engines...