I'll take the Cochrane opinion that evidence is lacking due to low quality small sample short follow up studies in those with poor dental hygiene.

Over the random internet randos views.

But thanks none the less!

People's teeth (and brushing technique/effectiveness) are way too varied to make such a general statement. I flossed for the first time at some point in my 20s, did religiously for a year or so thereafter, and still do occasionally - but at no point was it like 'how on Earth have I not been doing this' or loads of gunk coming out, nevermind rotten and smelly. Maybe you have just the 'right' tooth gap that it's both too tight for your brushing but not so tight that stuff doesn't get stuck.

(And for whatever it's worth, all dental check-ups since some point in my early teens at the latest have just been a quick look around and yep all good - I'm not saying this from a position (touching wood I don't eat my hat next time of course) of terrible dental health.)

Yeah they really hooked the public with that.

Same with hair, and bacteria on surfaces.

Completely hookwinked Jo public.

Yeah, flossing is a good idea if you don't want to get gum disease. Also a good idea to learn to floss correctly, not just a quick "in and out". (also good idea so you don't get cavities on the edges of your teeth.) https://www.youtube.com/watch?v=WviE5aa5Ha0 (how to floss)