I don't see people wall-cling stalling on SSE: Jungle, and those walls are cling/walljump-able anywhere. And this tactic would most likely get you in trouble with tournament stalling rules, anyway.
It's the fact that sometimes, people would try to wall-jump to assist their recovery, only to be barely below that threshold of the walljump-able wall, and fall to their doom. And even if they can memorize the location of every one of these thresholds (which is simply silly to have to do), it can easily be misjudged in the midst of battle.
And for PS2 with changing fields, the subject has been brought up about 2 pages back. I suggested that the wind field only make it a tiny bit more floaty, like somewhere around vBrawl's floatiness, and the electric stage's belts slowed down by about half-speed. But these changes might or might not be possible to do at this point in time (no one has tried, yet). (And to find a SSE stage with a similar layout to the basic field design of the neutral PS2 and use that to satisfy anyone complaining about the lost of that layout as a permanent thing.)