Quote Originally Posted by Hai-Etlik View Post
Fluvial islands are also unstable in the long term. One channel wins, or the island gets eroded away.
That's fair, although you can set up a situation where fluvial islands are also typical so even if one erodes you're likely to get a new one soon enough. This really does work better for rivers than lakes though, I suspect lakes that border such regions tend to have substantial wetlands around them.