It’s normal to make cobalt hard to reach, but the new system make it one way to go, from bronze to cobalt without other rarity. It’s better to never do intermediate craft because of the cost in credits which don’t change if you crafted cobalt with recycled gold or with recycled leads.
With trade up, we had checkpoint in the road to cobalt.
I played a lot with 383 bronze, then silver and then gold (after 16 trade up), and finally I still wait for it to drop in cobalt, but I can play it in gold.
With new system, it’s better to play always in bronze until you drop it in cobalt. We will see less cards in silver in the far future I think.
Apart from that, the almost 1:1 ration for the trade in is the step in the right direction, even if I never do it because I just want cobalt 383.