While I agree with the general sentiment of your message, there are quite a few meta-analyses on pubmed on the long-term safety and efficacy of gastric bypass surgery. They mostly show that while some patients do end up back obese, the majority do improve on many markers of health (weight, diabetes, ...).
Here's an example of a study if you're interested [1]!
Here's an example of a study if you're interested [1]!
[1] https://pubmed.ncbi.nlm.nih.gov/29340676/