Looking back, the Keith Papworth book (which I bought in 1960 along with my first guitar) is the reason why I don't play barre chords. In the Introduction it says
The three inversions in this tutor are given in different symbols
The First is a black dot
The Second is a star
The Third is a diamond
By placing the fingers in any of these series of symbols, the chord nominated by the key and chord name will be produced
Note that it doesn't say anything about stretching the first finger flat across the fretboard and holding down all six strings at once. On that first cheap acoustic which was already second-hand in 1960 the high action and heavy-guage strings would have made this impossible anyway.
The Papworth book even encourages the idea of 'one fingertip per string' by offering lots of chords that only use the top four strings.
In such ways do ideas spread!
Does the Eric Kershaw book describe the use of the first finger as a capo?
Ray