I don't personally see a bigger risk with a baby alone in the room we have for a nursery than a crib, to be honest. We have two built in corner hutches that we'll be using for clothing and storage, and the edge on each side of both hutches has a rounded sort of molding... Kind of hard to explain how it looks, but it means we wouldn't have any chests or bureaus in the room with sharp edges (if/when we need one, it'll be in the closet until our kiddo is a bit older

) We really lucked out there, as I probably wouldn't consider a floor bed for someone who isn't a confident walker if there were sharp furniture edges throughout the room.
Once babies can pull themselves up on the sides of a crib, they're prone to fall quite a bit anyway - and I don't plan on following baby with a pillow when he/she is learning to stand and walk, so I assume bumps and bruises will happen regardless.
Nela, the point you brought up is the one that actually got me thinking about this in the first place! Those "baby crib escape" videos on Youtube are soooo cute. I pulled a few up for my husband last week, and all the children looked like they were over a year old, most closer to 18-24 months, and then one popped up where the baby couldn't have been more than 10 months! I firmly believe in letting kids climb, run, and fall as a learning experience, but falling from 3 feet up is different than falling from less than a foot. I know that not all toddlers are prone to climb like that, and I certainly don't think everyone should stop using cribs just because their child COULD climb out, but it just got me thinking about this, so I figured I should look into it
I'm really curious to hear what sort of problems parents who did this at an early age encountered. This probably sounds really stupid of me, but I hadn't seen any concerns about a child being alone in a dark room when I was reading up on this, and I hadn't even considered how that would affect the baby. I wonder if they are less likely to get out of bed if it's that dark? As I mentioned, the room probably won't have much they could bang into, so it doesn't seem like bedroom falls would be any more or less harmful than falls in a crib - but I imagine it would still be pretty scary to get out of bed, then get lost in the darkness
Regardless, I assure you all that if this is something we decide is right for us, we would never leave our child alone in an environment we hadn't seen him or her hanging out in independently. Hopefully we'd be able to see potential hazards and make adjustments accordingly!
Thank you all again for all your input