The 2.1.7 update
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radically changed space mining in the late game. Without modules it is
1 chunk -> 20 iron ore + 0.2 chunk.
Effectively 25 ores per captured chunk.
With (very costly) +300% prod bonus
chunk -> 80 ore + 0.8 chunks
400 ores per chunk.
After the change at +300% we get
chunk -> 80 ore + 0.3 chunks
114.3 ores per chunk. 3.5 times fewer ores.
On the other hand, asteroid crusher has no loops influenced by productivity. Chunks are catalysts, and nothin recycle to chunks but chunks, and every recipe in crusher uses chunks. The productivity limit isn't necessary to prevent mater creation and could be removed, so asteroid crushing bonus work more like mining productivity.

