Only one AK moose hunt, so take it for what it’s worth.
I used Leica Geovid HD-B binos on my moose hunt. I bought them used, and now consider them the best piece of gear I have bought. I’ve had them to AK twice in cold wet conditions with no issues. I’ve also had them in CO, WY, and KS multiple times. Never a problem and I love them. Its easier for me to get an accurate range with the larger bino than a smaller rangefinder. I can also instantly range an animal instead of changing optics. I would not call them necessary for moose but they are certainly no disadvantage. For deer, antelope, or coyotes they are priceless to me.
A friend on our caribou hunt had a newer 3200yd version. They also worked great.
If you want to spend the money and are looking to upgrade I’d do it. I’ll never have a separate rangefinder for rifle hunting again.