Respectfully disagree.
In Ontario, at least where I'm hunting, deer at close range are far too wary for the movements required by field glasses.
Movement, or the lack there of, is the key to success here, unless you are in a tree stand, or a very good blind.
If you checked the average northern Ontario hunter, hunting in thick timber, you might find glasses, maybe one in a hundred or more carry them.
Timber conditions here are different than BC, and for the most part, we have more undergrowth. Thick enough that a deer may not see you until it is feet from you, if you are still. But move, and you will never know he was there. Field glasses in general give you a close up view of the branches closest to you.
There are exceptions, but not many in my gun hunting area.
For example, this year, a dog chase, involving five dogs, and a buck passes within 50 feet of me standing on a big flat rock where I'd been walking out from my stand (where I watch a narrows between two swamps). I saw nothing at all of the chase, despite it being so close I could hear the deer's feet hit the ground. The four pointer was shot by another hunter a few hundred yards from where I'd come out on the rock.
He had cut 'shooting lanes' in the brush, and the buck ran down one of them, practically right into the guy.