an action that would limit any rank less than full members from posting images wouldn't be nice on newbies that have the true intent of giving quality to the forum as well as also benefit from the forum.
The forum is mainly on text, it's a text-based forum for idea discussions, not for kids with cartoons, images, graphics. These things can be used, but don't over use them, as they're annoying.
Anyway, no more newbie jails with what forum has now. It's the
reality of this forum.Limiting newbie participation is very harmful for a community. Newbie jail will never return: I consider the newbie-jail period to have been extremely damaging to the forum. When barriers to participation are too high, then the best people often just won't go to the trouble of joining, and the people who are willing to jump through the hoops are often people who aren't good for the community: people with nothing better to do, scammers, get-rick-quickers, etc. Having a permanent newbie jail policy would improve things a lot in the short-term, but would end up being a fatal poison to the community.
The low signal-to-noise is a real issue which seriously annoys me and is often on my mind. But as you mention, fixing it non-destructively is difficult.