To use an analogy amphetamines have a honeymoon period, and it feels like a lot of people on these weight loss drugs haven’t been on them long enough to get past the honeymoon period and see what the effects are after 10, 20, etc years
I don't think anyone who is both informed and sane would suggest that it is impossible that there are negative long term impacts from taking the medication. Just that we have no current indication of them, and that being afraid about a "what if" without any concrete concerns when the alternative is the "continue being in one of the riskiest states possible for human health" is silly.
We do in fact know a lot about how these drugs affect people by now, and as you point out, we have well over a decade of data on them.