A Q on horizontal turns

Morgans wrote:

Google for that discussion, but in short, the rudder was used rapidly
going
from full deflection, to other side full deflection. The plane was
not
designed for that, and it failed. Part of the fault seems to lie
with the
airline, for not properly training its pilots.
--
Jim in NC

No Jim, I actually know that report, and the statements of both the
airline and Airbus too. The surprise is in knowing that such action,
which I think is natural, isn't automatically built into in the design
of an aircraft. Why do you think that's so? Aren't such boat-turns
normal? Should be, isn't it?

Ramapriya