One of the things that came up in one of the livestreams was that some of the changes to the starship heat shielding were to test a couple of different spots fo

One of the things that came up in one of the livestreams was that some of the changes to the starship heat shielding were to test a couple of different spots for those struts - because the booster doesn't do orbital-speed reentry, starship itself does, so to catch that, you need to avoid burning off the struts...