Yeah no technical reason. This flight was even going to be a rtls at first.do we know if the core has flown before? maybe its been used one and they dont expect to get a third out of it? lol
Maybe they just have too many Block 3/4s and they want to use the extra performance to speed up sat deployment. Wish they could recover it and put it in a museum!
maybe they will surprise everyone, use the extra boost from the first stage so the second has more gas at the end to try and recover the second