why is WT SOTA ?
asking out of curiosity...once had one on my Basis Ovation
If by this you mean 'Wheaton Triplanar' these days its simply called the Triplanar.
The answer is it has the lowest friction bearings in the industry (requiring a security clearance), has a damped arm tube (so the arm tube can't 'talk back' to the cartridge) and all the parameters you can think of are adjustable- even effective mass. The arm bearings are in the the plane of the LP surface, allowing the tracking pressure to be more constant as the stylus negotiates warp and bass modulations. The VTA tower (copied by a number of manufacturers) allows the VTA to be adjusted on the fly. Two scales are on it, one coarse the other fine, so adjustments are repeatable. With this arm I've found that the arm's ability to properly track the cartridge is far more important than the cartridge itself; properly set up (which takes about 10 minutes) cartridges tend to sound shockingly similar. The headshell is not removable; the cartridge connections are the same wire as at the other end of the tonearm cable.
I've not run into a cartridge it won't track perfectly although its probably out there. I've only used 15 or so different types and that's far too low a sample size. But they have been quite different and the arm has handled them with ease. My test tracks include LPs I recorded and produced so I know how they are supposed to sound. Bass is one of the things this arm really gets right.
Although straight tracking would be preferred, most straight tracking arms have some compromise to make them work- a very short arm tube with the bearings well above the platter height (meaning warp will cause speed variation) or lateral tracking mass might be a multiple of the vertical tracking mass, and or there might be only 4 wires instead of the required 5 (the 5th being ground) and of course the nemisis of all tonearms, slop in the arm bearings.