From R. Allen Brown, The Normans and the Norman Conquest (1968). Alas, this heresy is now orthodoxy:

It is a heresy, spreading among publishers and symptomatic of our ‘instant’ age, that footnotes put off even intelligent readers. Such readers should protest at the insult thus offered them behind their backs. Footnotes have an honourable place in history. They cite the authority for statement made, and they also lead all those who wish to follow into the deep woods, green pastures, and rewarding byways which lie on either side of the motorway of the text.