Not necessarily. I’m saying there needs to be better expectation management.
99% of people running a website are not going to know wether their HTML is sufficiently semantic to be easily parsed by a gem like readability, or even that that is what is determinative of how the feature works. The default assumption of users is that there is an issue “in Discourse” (or more often in the WP Discourse plugin) when there isn’t 100% fidelity between the post on their site and the content that appears when the user clicks “Show Full Post”.
Making an option like having a “Read Full Post” CTA easy to enable, and perhaps the default, would help I think.