I've seen that sweet tooth argument before, and it's a false argument. First, dumping has never been shown to be a weight loss tool or even an adjunct to the gastric bypass tool. It is a potentially very nasty side effect that some people with gastric bypass get - not all, though statistics as to the exact percentage of people who get it are all over the board, meaning no one really knows. There is no way to predict ahead of time who will dump and who won't. Different people dump with different foods - some with sweets, some with fat, some both, many neither. And a few unfortunate souls dump with all sorts of healthy foods. Dr. Keshishian has done revisions from gastric bypass to DS for people with uncontrollable dumping that was causing malnutrition.
You research seems to include the information a gastric bypass surgeon is telling you to sell you on gastric bypass. In reality, the long term statistics are available for both operations, and the DS has the best statistics of any bariatric surgery not just for percentage excess weight loss, but also for maintenance of that weight loss (which is crucial) and for resolution of almost all comorbidities. Even with the generous definition of "success" in the bariatric surgery world of losing just 50% of your excess weight, gastric bypass has a failure rate of about 30%. That's a high failure rate IMHO, and even at that, people who lose, let's say, 55-60% of their excess weight are classed as successes, even when they are still obese or MO. Add to that never being able to take NSAIDs again - and remember, even if you don't need them now you may as you get older - and the misery (NOT benefit!) of dumping - and there is just no real argument that favors gastric bypass.
I've met people IRL with gastric bypass who dump and still manage to eat around their dumping and regain weight. This is not just a theoretical point of view, it's reality. Do what you want, but at least know the truth about these operations. And take a good, honest look at yourself - what if you don't dump, and then you're stuck with an operation known to be less effective? What if you DO dump and it doesn't help?
And the stuff about DS being only for people with higher bmi? Pure BS. The DS is a standard of care bariatric operation for anyone who qualifies medically for bariatric surgery, and works just fine for lightweights. With either operation, if you don't take the necessary vitamins and eat your protein you will get into trouble. The actual rate of nutritional complications with the DS is very low and almost always due to noncompliance. It's up to each of us to make that commitment, but again this is true with either operation. You can get into plenty of trouble with gastric bypass, it just takes longer.