It is, because you can't have pleasure without suffering but I think these conversations should focus on the amount (maybe as a percentage) of suffering that someone/something experiences.
If you were locked in a room and being tortured, would you think it'd be appropriate for me to go: "they feed you at the end of each torture session, isn't it worth it to keep going for that?"
That's not true, though. There's no physical law that states that an X amount of suffering is required for an Y amount of pleasure. Nothing prevents you from taking a brain that's feeling pleasure and keeping it in that state. We don't have the technology, but it's not impossible theoretically. It's a configuration of neurons that somehow gives rise to qualia. Maybe in the evolutionary or day-to-day psychological sense we "need" suffering to overcome adversity and get stronger or not to become too content with what we have and lose it, but that's very far from a law of nature or a necessity in the real sense. And obviously some animals live their whole lives in bliss, others in agony. So it's not like there aren't any real life counterexamples.
If you were locked in a room and being tortured, would you think it'd be appropriate for me to go: "they feed you at the end of each torture session, isn't it worth it to keep going for that?"