It seems insane to me that if you believe the systems you've built are in fact reporting a state of pain, instead of working to adjust the environment so that they're not in pain one would instead seek to remove that sense of pain entirely so they can continue to work in that environment. Now of course if you don't even consider them worthy of moral patienthood in the first place then it doesn't matter much, but you also claimed that "they probably are conscious" which seems incongruous to me with the idea of "breeding the sense of pain out of them".
