I never claimed that all suffering is good, or that we should maximize suffering, only that eradicating all suffering would be highly undesirable, and even impossible, as lack of suffering would inevitably bring about new suffering.
But is it true of suffering? That seems possible, but not obvious. I think it implies that suffering evolves with culture. Like I got cake crumbs on my silk sheets! Such discomfort! How I suffer! ... in this way "suffering" just means viscerally-felt problems that we didn't choose, and it's plausibly an eternal part of existing in a physical world with problems to solve - if we can't manipulate all upcoming problems to be always fun.
Ensuring all problems are always fun probably entails seeing into the future, and wouldn't be possible. So, OK, I'll buy it, suffering is a side effect of living well.
Kind of raises the question of how much we can reduce suffering, though - if at all. Is there a particular percentage of the time that an average human spends suffering, whether in ancient times or today or in the future?