Good householder Sankha, Formator,
Although it might be often the case like that, and it's good to consider possible harmful and to quick placed critique, it very to doubt that the Sublime Buddha declared such a generalisation distinguishing by formal livelihood. Of course, if taking the ideal of the certain stand, it would be like that.
Commentaries might had drawn such conclusions based on ideas in ways and conducts, and foremost right view.
As one who, after not proved, investigated, ... right and good, but dispraises praisworthy and praises blameworthy, heads upwardly, one, after done right investigation, praising praisworthy, blaming blamworthy, shines and heads upwardly, given no akusala intention behind.
There are, of course, similes mentioning the different ways of training, where the layperson is of course mentioned as 'no match for an Ox'. Yet those teachings had not been directly given to lay people, householder.