shulchanhashalem:
I understand why you would not accept my anonymous report about R’ Herschel Schachter. Though he has said it in shiurim which are available on yutorah. I will try to locate one of them.
It happens to be that I just remembered that I have a copy of an interview of R’ Schachter which was printed in Kol Hamevaser in 2010, in which he says this idea. Here are two quotes from it, about the Mishnah Berurah:
The Mishnah Berurah then picked up on that idea and took it further. The truth is that the Mishnah Berurah is really more appropriate for benei ha-yeshivah and not for balabatim, since yeshivah bachurim usually have the luxury of being machamir, whereas balabatim generally do not. They used to quote in the name of Rav Henkin that the Mishnah Berurah is meant for yeshivah bachurim while the Aruch ha-Shulchan is more for balabatim, because the Aruch ha-Shulchan is often noteh le-hakel (tends more to be lenient).
And:
[emphasis added]