One thing I’m trying to be quite careful about is keeping the ruins from turning into a cheat system.
For me, the point of Abandoned Ruins is to make exploration more interesting and occasionally rewarding — not to let you win the game by finding the right wreck. So I’ve removed or toned down as much obviously game-breaking stuff as possible.
Most ruins are therefore deliberately limited to planetary / pre-space loot, and a lot of what you find will be most useful in the early game. Later on, the ruins should be more about discovery, atmosphere and the occasional nice salvage than progression shortcuts.
There may be one or two very rare exceptions, of course... because where would be the fun otherwise? ;)