Give us a welding tool that can be player configured to instruct the game to treat assemblies as defined by the player as single rigid bodies until acted upon by some outside force IE a collision, decouple extreme inertial force etc. At which point physics can be reassessed on a part by part basis within the assembly and craft as a whole. Allow the players to define the assemblies as they see fit. If a casual player wants to treat an entire 1000 part craft as a rigid body, fine. If another player wants to treat side boosters as separate assemblies, fine. If another player wants all parts calculated individually at all times, FINE. Continue to improve struts and reconsider implementing at least some level of auto strutting.
I stepped away from this game six months ago and said "this isn't for me right now, I will come back in a year and try again." Watching the development team has me... Lets just say, concerned that the game will be anywhere near ready in any reasonable amount of time. The world economy is in a really bad place and the purse strings are going to become tighter and tighter. These devs need to deliver results or risk KSP2 becoming abandonware. LETS GO I am rooting for this team and this game!