I have an old SME 3009 tonearm, which has inbuilt anti-skating via a small weight dangling on a line which passes over a very small pulley. The other end of the line loops over a graduated rod to apply side pressure to the arm.
SME made almost 100,000 of these arms. With mine, it is very noticeable if the thread falls off the pulley.
My latest turntable, a Holbo, has a tangential tracking arm riding on an air-bearing so there is no need for any anti-skating. Also, the horizontal tracking angle never varies, whereas most pivoted arms have up to 2-degrees error purely from the geometry.as the stylus moves in an arc across the record.
I believe that for two-channel records, horizontal and vertical tracking angles are equally important because each channel, which is 45-degrees to the record surface, is equally affected by horizontal and vertical errors.