Why do you say that? I've never heard that before. Every user I've seen reviewing it says it's more accurate than Wacom
What they're probably talking about in terms of "accuracy" is parallax/offset between the stylus tip and the display, which is one area where the Apple Pencil excels. Wacom's standard product lines (Intuos, Intuos Pro, Cintiq) employ EMR digitizers, and size is a major drawback--the tablets are oversized to extend the edges of the digitizer panels beyond the tablet's active area, which is meant to account for the more exaggerated offsetting that occurs at the edges of the digitizer. Additionally, they're very thick, so there's a considerable gap between the tip and the cursor when you touch the stylus down. Calibration is meant to ameliorate this somewhat, but some degree of offset will always exist.
Active digitizers like N-trig (Surface Pro 3 & 4) and the iPad Pro's tech are a little different; they employ battery-operated pens to transmit input signals, and the panels themselves can be made smaller, leaving software to handle much of the heavy lifting. The relaxing of the size limitation (among other factors) makes them favored in more portable applications like tablets, but it comes with some drawbacks of its own. Apple have clearly gone to great pains to address many of the issues seen in competitors' offerings; the pen tip is extremely accurate, and predictive tech rolled into the pen API is so sophisticated that there's almost no perceptible lag unless you're really trying to outrun your strokes in slow-motion video. It's wanting, however, in the sort of fine-grained control that a Cintiq can offer; with a Cintiq, I can use a 100-pixel brush and easily flick a single stroke all the way from subpixels back up to max width and opacity. With Apple Pencil, it tracks your direction and pressure and will apply smoothing across the width of the stroke, which results in a more even-width line--desirable in certain applications, certainly, but not all.
If accuracy and a clean, average-weight stroke are your main considerations, the Apple Pencil is fantastic in both departments, and I'd recommend it to anyone with those particular needs! It's beautifully crafted and I'm thrilled to see it garnering such a positive response in the creative industry. It's possible that a perfect non-Wacom solution for my preferred uses just doesn't exist yet, sadly.
