It would be interesting to know any details behind the case of DLH changing from silent to reading out loud (is that so?).
I was trained and until today operated in line with the OEM's procedures. During my 2 or three jumpseat rides in Lufthansa cockpit (fully approved i.a.w. all the books by the way) I was, however, rather impressed with the - then silent - way of doing things.
Vilas' comment about the inadequacy of FCOM, FCTM and one's personal experience as a basis for "improving" SOPs is words of gospel!