The point of reading is enjoyment, savouring language and thoughtfully absorbing prose. It's not about cramming in as many books as possible, inflating your reading numbers.
For students, or those force-marched through dry, uninteresting professional books, perhaps there's a purpose. However, for those who love writing, reading for the love ot it, it makes no sense you'd want to blow through books and miss the richness they bring.
It's not about numbers; it's about a love of reading.