This article says:
Today, in the absence of the Temple, the mitzvah of the Korban Pesach
is memorialized in the form of a symbolic food placed on the Passover
Seder Plate, which is usually a roasted shankbone. Ashkenazic Jews
have a custom of not eating lamb or goat during the Seder in deference
to the absence of the Temple. Many Sephardic Jews, however, have the
opposite custom of eating lamb or goat meat during the Seder in memory
of the Korban Pesach.
It seems to be a widespread custom among Ahskenazim not eat any lamb in any form. I don't know of any Ashkenazy who does otherwise.
IMO, this is not a chumra, but rather there seems to be some basis to the thinking. It seems to be the same reasoning why I have seen many Hagaddah instructions state not to point to a roasted lamb shank on the Seder plate while saying "Pesach zeh".