Flossing is absolutely critical every day at least two times a day. Bacteria build from food stuck between your teeth can create health problems. Plus it will give you bad breath too if sits there.
I am not one to conform with the wisdom of the herd. If a person avoids reading then they must rely upon the herd.
If no studies exist, then floss effectivity is UNKNOWN.
I almost never flossed, ever, and still have all my teeth with no between teeth cavities. I have high guilt at the Dentist, it is always good news, so he makes no money. Just met a man getting 3 teeth pulled. He suffers from ignorance. Sad & shocking hearing those stories.
Dental health is more what you put inside that mouth. Just like getting canker sores in the mouth means eating poorly.