He just needs to take a little time over the finer details, like string ferrules in line etc.
I'm not really keen on the no trussrod thing, but if he decided to start installing them on new builds as standard, I think I'd take one on!
Steve has said that he feels that the sound of his basses is helped by lowering the amount of metal in the instrument, that as vibrations move from wood to metal the sound suffers. I'm not sure if that can be proven, but his basses do have a warm and distinctive sound.
The necks are so strong that they will not move, and so there is no need to have a trussrod, although if you really want one he'll put it in.
I use a fretted Wishbass for a R+B band I play with and a fretless for a big band. Both fit very well in the sound mix. Last weekend the R+B band was backing an Elvis impersonator and I switched from the Wishbass to my Rickenbacker with flat wounds... mostly for the look. The guys in the band and the sound man mentioned that the Wish sounds better, so I'll be back with the Wishbass next weekend. The fretless for the big band works great.