I'm no pro, but I've bought and sold a dozen basses over the past few years, and do my own setups through changing New England seasons. I'm not picky about my action, but I've been able to make all of them play without fret buzz: Squier, Sire, Hohner, Dean, Warwick, G&L's both USA and tribby--acoustic and electric, rosewood and maple fingerboards, brand new frets and frets most would consider past their useful life. I shoot for 0.020" relief and 0.125" string height over the last fret.
Now, three or four times I've brought a bass to my luthier (
very reputable) for fret work or something more invasive, and he'll do a setup for me. His setups are SUPER precise. So precise that the basses play absolutely perfectly when I pick them up, and buzz like a mother@#$%er on every fret the next day. That's because his shop is super dry, so back home the neck absorbs moisture, expands, and increases the tension in the truss rod just enough to completely flatten the neck.
I think your best bet is to get yourself a capo, feeler gauge, and truss rod tool and watch a couple tutorials on setting neck relief. You're talking a $30 / 30-minute investment. Otherwise I'm sure many people would gladly buy your brand-new bass at a steep discount and do it themselves.
I'm sorry but I can't humor your notion that a bass with a truss rod and saddle-height adjustment could be designed for fret buzz--that's just silly.