Due to the offset between the cartridge's axis (which is approximately tangential to the disc) and the tonearm's pivot, the force applied (through friction) by the rotating disc to the cartridge tends to draw the tonearm toward the center of the record and distort the balance of the sound and of the wear suffered by the stylus and the vinyl groove.
To prevent this, an appropriately-sized opposing force (a rotational torque) is applied at the tonearm.
This is accomplished in various ways by dedicated mechanisms, depending on the tonearm's manufacturer, and ranging from a small counterweight adjustable by a knob, to adjustable spring or magnetic mechanisms, usually calibrated in grams of force.
Thus, any opposing force applied to the tonearm to counteract skating, if not variable during the playing of the record, is fixed, and at best an average value, only really perfectly in balance with the skating force at just one unique radius from the center of the disk.
Yet, anti-skating schemes perform a useful function in minimizing asymmetric wear of styli and grooves, although not eliminating it entirely.