Imo classical economists were generally more clear-sighted and honest than modern ones. Of course they had their biases and perspective based on their class (and their audience), but at that point economics was so poorly understood that theorists were legitimately trying to figure stuff out, moreso than trying to produce propaganda. Of course, the industrial proletariat and threat of socialism wasn’t really present yet either, so the class conflict was more about new money bourgeois vs old money aristocrats and landlords.

Marx and Smith are a lot more similar than most people think, because Marx was writing in the context of various economic assumptions that come from Smith, such as the labor theory of value, which is usually attributed to Marx but actually comes from Smith.

The thing about Smith though is that his writing style was very dry and repetitive so nobody actually reads him, at best, they might read abridged versions which cut out any inconvenient parts like that. So he just kinda became known as the capitalism guy and is thrown in the same category as Ayn Rand.