[Avodah] Waiting to Daven Maariv on Shavuous

[SBA]

From: Yitzhak Grossman 
Yitzchok Levine <Larry.Levine at stevens.edu> wrote:
> It is time for me to begin my annual campaign to try to convince 
> people that there is no reason to wait until after Tzas Ha Kochovim to 
> daven Maariv on the first night of Shavuous.
> Many may be surprised to learn that it was not the practice in the 
> Ashkenazic world in the time of the Rishonim to wait to daven Maariv.
> Also, it was not the practice of some Achronim.

But some Aharonim do encourage it (see Taz and Hak Ya'akov beginning of OH
494), so how can you possibly say that "there is no reason to wait"?  Do you
believe that any Minhag instituted by Aharonim is automatically invalid?
What about Rishonim? If they had a Minhag that didn't exist in Talmudic or
Geonic times, should we abandon it?
>>

The MB and SA Harav who are the leading poskim for most of the Jewish world,
both say to wait.

SBA