JUST THINK OVER RANDY11
CHANGING THE PAGE IS FUNCTION OF NECESSITY.
For quick changing of page or to move down in a page - hard button may be convenient.
but the hard button soon lost its funtion if u use frequently.
the softbutton or icon is best for frequent using and it is long lasting. this is what all other eink devices like kindle are doing.
so, having page turn icon in annotation bar is a very wise move.