Really Chuck?
Face this, please, since these are very obvious examples.
The Chasidim ALL quote the Bach as to the permissibility of Chodosh, and NONE of them as much as davven the nusach the Bach used, never mind take on his chumros in Hilchos Shabbos, Kahsrus, etc, or even care to know if those exist or not.
Ashkenazim follow the psak of the Tosafos regarding Zman Krias Shema, against the Rambam, yet, have little problem davening k’vosikin when needed, like the Rambam, although the same Tosafos hold that it is a bedieved.
I only brought these 2 examples that are apparent to everyone, without delving into Choshem Mishpat where in almost every siman there is “kim li” application, which, perhaps, to some will definitely appear as pick and choose.