Snaffles, especially 2-joint snaffles, are "safe." You can't do a whole lot wrong, even if you're a green rider without quiet hands. Also, training a horse to go in a snaffle means the horse is light on the bit and responds well. All of my horses go in some kind of snaffle, even if I had to start them with a curb at first. I "wean" all my horses back down to snaffles as I like the control I have over the horse with one (I can more easily influence the horse's way of going without creating a "false" frame) and I give lessons, so I don't want a " big" bit in the hands of a new rider.
If someone comes on here and ASKS for advice on a bit, I'm going to advise to go with a snaffle, or I will give the "step down" training bits to go from current stage in training/going to snaffle trained.
I may ask why someone is in a certain bit, but only if they're asking about training issues or behavioral issues under saddle, as the bit can influece my answer for both type of question. A change in bit or whatnot could help "fix" the issue.
That said, I am a big believer of, "if it ain't broke, don't fix it." If you like the way your horse responds to the bit, the horse's head is at a natural level without a tiedown or training fork, and/or the horse doesn't toss their head or gape when you pull on the reins, then there is no reason to switch to something different. And, if you are having problems in one or more of those areas, a change in bit may or may not "fix" your issue. There could be other reasons for those behaviors as well, however, the bit is a simple thing to rule out by trying a snaffle