Whether the sixties "saw their longest period of sustained musical growth"" of the Stones was  taken out because it is too much a matter of opinion and can easily descending into tiresome - and probably emotional - arguments. Reggae is a "personal favorite" of Richards, as is blues, country, soul, so the point of mentionng this is unclear. Richards is not the only fan of reggae in the band and drawing attention to Richards affection for the style seems trivial and not not worth special mention.