I never sit in the rain. I will take advantage of a light rain to do some needed scouting. I feel that's the best way not to pollute an area with my scent as the rain washes it away
Sorta how I look at it too. I'm pretty sure rain doesn't mean that much to deer, they live in it, but there's also a reason you seldom ever / never see deer in the rain like you do on better weather days (I'm talking about in fields when you're driving around, etc). Might not be the wetness persay, but rain typically means a barometer change and/or other unseen factors. And honestly I don't like to get my equipment wet. I do NOT hunting from permanent stands or shooting houses, I always use a climber....so hunting in the rain for me literally means IN THE RAIN
And then maybe I've just lost enough interest in hunting that I simply don't want to go badly enough to sit in the rain. I hunt just about any time I've got the chance, so a rainout gives the excuse to spend time with the family or do chores. It's just such low odds of seeing deer that it ain't worth it anymore.
Oddly though, I'll go fishing in the rain and not think anything of it, but hunting is different. And then again, with age I've even gotten to where I don't want to get my boat wet either.... there's a LOT of work that goes into hunting or fishing in the rain (getting everything dried, cleaned, and restored afterwards) and the return on investment is really, really, really poor. It's a bad "cost vs benefit" analysis.