well for one thing, i've never been one to care about prefacing everything i say with "in my opinion" or "as far as i know" or "it is my personal experience that" because i think it's pretty much implied whenever anyone discusses anything
so i'm not sure what you're saying exactly, that discussing things is not ok unless you make an effort to do it as timidly as possible? just ain't my style bro, if i'm sure about something i'm gonna act like i'm sure about it
the flipside of this attitude, if i can toot my own horn for a second, is that if i don't know about or care about a subject, i shut up about it instead of spouting ill-informed nonsense. you will note, for instance, that i've never once posted in the super-long NFL thread