Subtracting from Talmud

An interesting Tefillah exists in the Talmud and in the Tur but was deleted from our daily cycle by the Bet Yosef and the Shulchan Aruch

The Tefillah is recited PRIOR to entering the Privy and maybe found AFAIK verbatim in TUR Orach Hayyim 3

The SA OH 3:1 mentions it and states "now we are no longer accustomed to say it"

The quoted sources in Be'er Haggolah
1 to say: Talmud Brachot 60
2 to omit: Bet Yosef

[Note: I have not recently seen this BY inside]

Questions:
1 How can the BY omit a Talmudically mandated prayer?
2 Why don't we restore it?*

Note:
A) The Shaarei Teshuvei quotes Arizal to restore it.
B) Artscroll and others restored the Talmudic "birkat Ba'al habayyit" which was neglected for a long time

KT
RRW