I think similarly to CeNedra. Backers Build 5 looks like product where most of content was just thrown into, without polishing and checking all the things. Even without balancing and correcting some of the basic values. But their internal build is more complete and probably without most of the issues we encounter in “our” build. Imagine amount of feedback received just with F12 functionality. Quality team must continually sit there and fix all of this, so their internal build must be without most of the issues we encounter. I suppose that most of the fixes was just like “change it for enabled”,“add exception handler at the end of that action”, “add border check for this loop”, “put that IF check before this line”, “add false condition to that alien’s AI action check”, “enable this function for other aircrafts” etc. Those are all quick fixes.
All larger things which players request on this forum right now are probably postponed after release to appear in some DLC.