Honestly, I feel better if an author makes their personal biases known rather than try to conceal them beneath a facially impartial analysis. It naturally invites more scrutiny on the claims being made, but IMO it’s more intellectually honest to invite that scrutiny explicitly. Those with an axe to grind about any given topic who are reasonably rhetorically capable could write an ostensibly nonpartisan account which nonetheless leads readers to the authors preferred conclusion.