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The leap from gpu too Asic is 100x plus hash rate increase so easier to do 51 attack.
That was true for CryptoNight, but not for Ethash (E3 is 180MH/s at 800W) or Equihash (Z9 is 10kSols/s at 300W). Respectively, that makes the E3 about as powerful as a typical 6x RX 570 GPU rig but drawing much less power and costing less as well, while the Z9 is about 2x more powerful than a 6x GTX 1080ti rig while also drawing much less power and costing less. In other words, not even close to 100x more powerful.
The leap from Asic to better asic, is 2x at best due to the limitations of chip size nm and power efficiency vs high equipment cost to manufacture a better Asic over previous generations. This is not enough to do a 51 attack on whole network.
I literally just pointed out 2 examples where the 2nd gen ASIC was 5x to 10x faster than the previous gen and yet you still tried to claim only a 2x improvement is possible?
Right, okay. I think I'm done here.