Agree about condensation. My hands sweat a lot, too, regardless of temperature. Mittens with shells need to be dried at night, which is easy on day hikes and difficult or impossible while backpacking.
Mittens without shells still need to be dried, but they are much easier (sleeping bag or under a jacket).
VBLs are an alternative for overnights. I can see why they are semi-popular. Food handling gloves are UL, nitrile gloves are tougher if you carry a couple of pairs and turn them inside-out to dry. Especially thicker gloves, like 5-9 mils. Maybe neoprene (wetsuit) gloves.
An advantage to VBLs is that you only need to carry one set of insulation. I would carry a dry spare of fleece or wool mittens. As usual, YMMV. :)