Discomfort is part of most definitions of pain, example: "pain: physical suffering or discomfort caused by illness or injury."I'm talking about physical pain, I'm sure they feel discomfort.
I can see where you're coming from but because invertebrates, especially 'bugs' are so much different from humans its very difficult for us to see completely how they may experience the world around them. I would be more likely to respond (positively) to arguments stating that insects/'bugs' have no evolutionary advantage to feeling pain because they don't live long enough to learn from experiences that are damaging towards them unlike higher order animals.
Anyway, like you said, there's no way to know for sure at the moment.
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