[Avodah] saying tehillim

[Eli Turkel]

<<My guess is that there is no posek or minhag who has a clear cutoff
point to describe which additions they say and which they don't.
Rather, I suspect, each addition was judged on its own merits: "Will
this community appreciate this proposal and benefit from it, or will
they consider it to be a burden?" And thus, some were added to the
local nusach and others were not. If I am correct, then this is what I
was referring to in my post, when I wrote that It is also quite
possible that in some communities the
minhag simply didn't "catch on" and become popular.>>

As an example is saying kabbalat shabbat. This was introduced
by talmidim of the Ari. In nusach sefard (edot miszrach) it
is somewhat different than nusach ashkenaz (and chassidim).
This took a while to become universally accepted. There was an
era in which some communities said it and others objected.
In the long rin "it caught on"

As an aside it is generally recognized that kabbalat shabbat
should be said before sunset but many communities dont make it
on time

-- 
Eli Turkel