Breadboard ends, another question....

OK, I am building a piano bench from Mahogany. I looked at one on t-day to
get some ideas. Breadboard ends.

It looks as though the original had a sliding dovetail holding the
breadboard on. The top was about 16" across the grain. It looks as though
the end of the breadboard had a mitered corner before the DT slot was cut.
Sort of a breadboard end for the breadboard! No end grain anywhere.

From my initial Google searches it seems there are two purposes of
breadboard ends.

1) Aesthetics
2) To help with warping

The downside of breadboard ends is that they will move differently than the
piece they are attached to.

In the antique I was looking at; the finish was intact along the edge of the
breadboard. I saw no evidence of any dowels or pins or any other attachment
other than the dovetail. The corner, where the dovetail was visible, was
completely smooth, no evidence of any movement.

So, my questions....

1) Do I need the breadboard end for any other reason beside aesthetics on
such a small project?
2) Do I need to be concerned with wood movement on such a small project?
3) If #2 is No, could the breadboard be biscuit, splined, M&T in place with
glue along end?
4) If #4 is Yes, and I do not want any dowels showing, and I do not want to
risk it breaking off when someone sits on it, how else, besides a sliding
DT, could it be attached?

And a final somewhat related question....
Should I do my final edge profile before or after attaching the breadboard
ends? I'm thinking after.

And, start to finish on this project before Christmas! The wood is in my
truck, starting tonight.

THANKS ALL!!!