1) It is absolutely not common practice to allow a mohel to orally suck the blood out of an infant's penis. If it's practiced at all, it is only in extremely fringe groups of Jews, not just orthodox or ultra orthodox but a very small group, truly some hundreds of people, practice it. I don't have the data, probably no one does, but saying Jewish circumcisions involve this would be like suggesting all baptisms look like this: https://www.youtube.com/watch?v=aFGHerqhSC8 To call metzitzah b'peh common practice, or at all part of ritual circumcision, is an anti-semitic trope. Comparing a key tenet of Judaism to a cult is both simplistic and demeaning.
2) I grappled with the decision to have brises for my sons. I don't think it's possible to know or define how traumatic such a procedure is; is it worse than giving a 6-month old pierced ears? Is it worse than travelling through the birth canal and having your umbilical cord severed? Who knows. As obvious as it may seem, the pain of a bris impossible to gauge. My sons all began crying as soon as their diaper came off, and their crying was no more intense once the cutting occurred. By the way, it's not like they make a dotted line with marker and snip around the foreskin; whatI witnessed involved a metal device (a type of clamp I suppose) that is slid between the shaft and foreskin, and like a modified cigar cutter, the mohel cuts away the foreskin in one motion. There's a lot of discomfort, maybe pain, but as a father of 3, I assure you every doctor's visit and many trips to the park involve similar levels of harm.
3) I realize mohels are not doctors, but there are mohel academies that train and certify these specialists. To say they are not doctors is one thing (and it's true), but to say they are not medically trained is another. They don't go to medical school but they learn about the biology of the procedure, proper methods, proper tools (including sterilization), post-op treatment & care, etc.
It's not an easy topic, but I don't think it should be hard to talk about. Complicated or interesting to describe, maybe hard to judge or rationalize, but let's talk about it openly, let's avoid disparagement, and most of all let's bring some nuance to this conversation.