On Drosera, Utricularia, Sarracenia, and basically any other carnivore except VFT's I do not cut the stalk. I cut my capensis stalks purely because I do not want capensis babies everywhere, I like nice, clean pots. (I even bare root California Carnivores plants so I don't get the stowaways).
Here's a quick guide per genus.
Nepenthes - Don't cut this! Seeds are rare and hard to come by, and you can attempt cool crosses.
Heliamphora - Same as Nepenthes, but the flowers are also very pretty.
Utricularia - Keep em to enjoy, they're very nice flowers. Some better than orchids.
Pinguicula - Let them bloom, sometimes you can cut a few if your plant is sending up several.
Drosera - Cut the stalk if it's a weedy species and you don't want babies. Otherwise, let it grow. Annuals like Burmanii will die, so maybe trim it.
Byblis - Let it flower - Most are annuals anyways.
Drosophyllum - Let it flower. Most die after setting seed, so best to get propagative material while it lasts.
Genislea - Same as Utricularia
Sarracenia and Darlingtonia - Always let it flower so you can get the seeds.
Bromeliads and other plants - Research!
And lastly, the VFT - If you're going to feed it, don't cut it. If you want seeds, don't cut it. If neither A or B is true, Cut it.
And there you go!
Your answer plus a guide to many others about the age old CP question - "To cut or not to cut"