Arthritis means I have very knarled and twisted fingers, so in most gloves my fingers are constricted, that's if I can even get them on.
I also have Reynaulds quite severely.
I have two drawers full of "the latest and best" gloves and mitts, and have spent a fortune on them over the years - none of them will keep my hands functional in even slightly cool conditions.
But Pogies (bar mitts) do work because they create a microclimate that covers hands, wrists, bars, brakes, and shifters. I vary what I wear on my hands under them from nothing up to fingerless mitts plus thin overmitts to keep disposable handwarmers in position. There's enough room to stash the extras (and the flapjack) if I get too warm. They are easy to put on and remove, but are bulky to stash away.
Mine are HOTPOGS - made in England from the same sort of material as traditional saddlebags, and I could not ride at all in winter without them.
BUT - they only work with flat bars. I did try a different brand that fitted drops, but the bike was uncontrollable in even a slightest draught.