Were those prioritized? I would have put velocity first,then will devs like it. Those are coupled. If they like it, it is less important if you can hire people

Were those prioritized? I would have put velocity first,then will devs like it. Those are coupled. If they like it, it is less important if you can hire people who know it already, and likewise, if your velocity is high, maintainability becomes less important. All those are subject to physical constraints though. Much of the worlds code is embedded, and thus severely constrained in both compute and power. That limits your choices, but within those choices your criteria are still absolutely the correct ones.