The quality of life was radically different, and they didn't live as long.
The complexity we see today exists for a reason, or really, a multitude of reasons. Would it be nice if things weren't as complex? Definitely, but do we have any reason to believe that you can have a world-wide distribution network of goods without this complexity? I would be very interested to hear any argument that this is possible, but I don't think it exists.
It is certainly possible to simplify some things in isolation, but the complexity we see is the product of billions of humans interacting with different governing and power structures, cultures, monetary systems, value systems, and more. So any simplification would demand a simplification of those systems. How realistic is that? How desirable is that?