[Elecraft] Data A filter questions

[Wes Stewart]

I don't do much PSK operation but I was just fiddling with it and noted something puzzling (to me anyway).

Data mode A, although basically a USB mode, defaults to CW-like filtering.  The "NORM" setting is 400 Hz (my CW filter width, I guess), "Shift" is 1.5 KHz (and very limited) and "LO" and "HI" are locked out.  Considering how much PSK operation is done, this is quite limiting.

Is there some compelling reason that I'm overlooking why the default for this mode shouldn't be the same as SSB, with the options to have both SHIFT/WIDTH and HI and LO CUT?

Wes  N7WS