Considering I haven't contributed a line of code (yet) to core, I hate to say anything critical, but I noticed that Drupal 7 is displaying a "read-more" link for every teaser, even those in which all the content is being displayed. Having someone click a link to read more, when clicking the link provides no additional content is...deceptive, at the least, and probably aggravating too.
The rationale for the read-more link always being on a teaser, based on the issue, is that the architecture has become too complicated to determine if there is more content, or that it will be negative on performance to do so, or both.
This is sounding Catch-22 Major Major-ish to me, like someone trying to convince me that the fuel gauge coming on when the tank is full is justifiable. I hope that architecture is not going to start overriding common sense. I also hope I won't get drummed out for blogging this!