[Avodah] C: we don't rely on manuscripts of Rishonim to overturn psikei halacha

[Moshe Y. Gluck]

R' MB:
> IIRC (from discussion in volume 12) , the CI had a much more
> rationalistic explanation.
> 
> Who knows what girsaos haven't been found? Maybe there is a good
> reason why this copy was the one that ended up in genizah? If we open
> up the door to changing halakhah on these grounds, ein ladavar sof!

He also, IIRC, had another rationalistic reason - if we are stacking
Rishonim against each other, and by adding Kisvei Yad we change the balance
in Psak, Mei'heicha Teisi that there weren't other Rishonim who held like
the first Psak? Maybe we will find those manuscripts tomorrow! IOW, by
admitting new Shitos that hadn't played a role previously in Psak, we make
the whole structure of Psak (such as it is, see last few hundred posts :-)
) unstable.

KT,
MYG