Remember that G.violacea and G.lobata are annuals in the wild, so usually they are not around in the dry season. Often theya re submerged in the wet season, but it is not normal.
Other species love being underwater, like G.sp."giant violacea", G.aurea, G.repens, G.guianensis, and G.sanariapoana.
Last of all remember, that even when underwater, it is usually running cool spring water, which is VERY different from sitting a pot in warm water... (although a few years ago I was at a really hot region of W Brazil, on a very hot day, wading at a seepage wher ethe water collected into a a stream which must have been around 40C, and it was full of Drosera, Utrics and Genlisea which seemed not to mind the temperature!)