I would say yes...more humid is much better than more drier.
Not talking about dripping wet humidity...but like, if you had constant 60% humidity...it would be better for the wood than constant 20% humidity.
I think the wood will absorb what it can up to a point...and that's it...it's not just going to keep getting wetter and wetter...but when it goes dry and stays dry too long, the moisture in the wood keeps getting sucked out more and more, and you'll get to a point where it will start to crack from the dryness.
So I think the Brian's problem may actually have been too little humidity....which could add to do that dry/crackly tone he was getting.
My studio tends to stay pretty stable, or if it changes, it does so very slowly. In the dead of winter, the humidity doesn't get below 30%...and in the hottest summer months when it's rainy...I may see it get into the high 50's.
Since moved here...I've never had to keep resetting my guitars from season to season.
My first real taste of very low humidity was a few years ago in Arizona, and honest to god, I felt like I was shriveling up from the inside. Lol. I've traveled a fair bit, but I've spent my entire life living about an hour from the gulf of mexico. New Orleans to Houston is about a whopping 50 foot swing in elevation from seal level. Go going to the mountains or extremely cold and/or dry climates is pretty sucky for a warm weather, high pressure, high humidity guy like me. So I can see why a guitar would hate it too. My house has central A/C and heating so it stays around 72-75 all year long and I have no idea what the humidity is, but it's comfortable and I have no guitar problems.
When I was racing, we loved being at sea level when a cold front would come through. I'm talking gulf coast coldfronts where it'll drop to the 40s or 50s. No snow or ice. That's a joke for you northern guys, but for us it's cold. High atmospheric pressure with cold, dry air is instant free horsepower.