Wires by themselves are not evil, the annoying thing about what we consider "wired VR" is that the wires are attached to some fixed point in space (the computer), so you need to dedicate some spatial awareness to where the wires are and periodically untangle yourself or whatever.
In contrast, a wire between two parts of the body that don't move that much in normal operation is basically effortless, and besides the knee-jerk perception "eww wires" isn't a real issue. (By "don't move that much" I mean that the movement range of the spine, the longest section of body that the wire would span, is much more limited than, say, the arms. Controllers wired to a headset would be supreme chaos, but headset wired to a belt piece is not nearly as bad)
I tried the Magic Leap at work, and the computing and battery is off-headset, attached to your pants or something with a simple wire. It did not impair usage nearly as much as, say, my HTC Vive, which has a long wire to my computer I must take care not to step on or tangle myself.
On the other hand, when going out with VR friends, the Quest users are always the first to head off, due to their batteries running low, even though the humans would be comfortable continuing to use it. So I guess a place to put more battery, or even more computing power, (though that is rather more complicated) would not be a bad idea at all.