Went for an Arcam a49 when I last splurged out 5 yrs back.
Was considering separate amp pre amp at the ttime but if I remember right balance controls werent typical for separate preamps.
As it happens my listening space isnt ideal and also I have a mild hearing deficiency in one ear.
Since both the ear and the most problematic parts of room acoustically are on the same side (my left) the balance control is necessary for me from time to time.
AS I commented i another post Im moving my tv out of the room as its placement was interfering with the soundstage so it maybe with that done I might find the balance control unnecessary-we shall see.
Even so good to have in case of need and if not needed it wont be engaged so no downside near as I can tell