It shouldn't be about how much skill is needed to produce the wall, or how long it takes. That's absurd!
IF a wall is overly simple to create/reproduce the issue is that it is VERY likely to be repeated.
One of the 'old rules of wall moderation' [sins] was called 'the blue swirlie'. They were a no-no, not because someone didn't like blue.....or swirls....but in fact because most people prefer walls in blue ....and a 'swirl' is about the simplest 'filter'/function you can apply to an image.
We get a few per week submitted....and if they're lucky they get as far as PP.
Fractals are essentially point-and-click-go-make-a-coffee-come-back-and-upload-the-result...and can be 'made' as quickly as your CPU allows. Some look OK, actually...but most are repetitive and are only slight deviations from the default/predictable.
In order to save people from having to wade through a bottomless sea of repetition in the gallery there'll be a tendency to redirect the 'flood' to the Personal Pages.
Re fractals....I remember my seeing the first one....and being amazed by the mathematics that it represented/generated...that the closer you focus in/enlarge it....the more it's repeated. Did I rush off and declare it/they make brilliant walls?....er....no....
When wanting to make comparisons like this thread please avoid dragging a fellow member into it for no good reason.