What is the effect of comments by a judge that generalizations are made based on generalizations?

[505] Neither the parties nor the informed and reasonable observer should be led to believe by the comments of the judge that decisions are made based on generalizations. It is important that judges be aware of the social reality that support decisions based on an examination of the objectives of the legislation before him or her. One statement of the content and purpose of this doctrine is outlined in Varcoe v. Lee et al. (1919), 180 Cal. 338, 181 P. 223, at page 226: “The three requirements . . . — that the matter be one of common and general knowledge, that it be well established and authoritatively settled, be practically indisputable, and that this common, general, and certain knowledge exist in the particular jurisdiction — all are requirements dictated by the reason and purpose of the rule, which is to obviate the formal necessity for proof when the matter does not require proof.”