Add bottom connection node for inflatable heat shield, because this option was in KSP1. In KSP2 inflatable heatshield doesn't have this node, and it's so uncomfortable to use it like regular heat shield and make crafts with it. So it is so difficult to build suitable craft with inflatable heatshield on its bottom, because you can't connect lower stage to shield. I can't imagine how to make concept of reusable engine compartment of ULA Vulcan rocket