Booster re-usability is only the first half of the problem. It's the second stage re-usability that makes Starship viable despite its massive second stage. The re-entry heating is trashing their second stages which would make the killer feature of Starship, fast turnaround, impractical.
Also, as far as I can tell from their last test video, they are still shredding their Flaperons at the joint.
Also, as far as I can tell from their last test video, they are still shredding their Flaperons at the joint.