The commentaries and the Visuddhimagga are not canonical. Moreover, the commentaries do not present a homogeneous doctrine. It's not uncommon to find multiple opinions presented regarding a particular canonical passage, etc. It's also not uncommon to find quite dubious etymologies of particular terms and an obvious lack of understanding of canonical metaphors, and so on. This is due to the commentaries being authored by people separated from the historical, geographical, and cultural situation of the early Buddhist community. This has been well documented by a number of translators and scholars. Thereforewhile there commentaries are also important, they aren't of the same caliber as the Tipiṭaka.
Could I ask for some evidence of their lack of homogeneous content.