There is no necessity to adjust the azimuth, but there is an advantage in doing it. It´s a good thing to me knowing one is getting the most out of the cartridge/needle. I now know with my latest set up I have -33dB cross-talk from both channels, and a channel balance better that 1dB. In this case the tilting is maybe 1deg, which is no big deal. It´s just good to know the cartridge is performing the best it can. And as I see it it´s not more important with expensive cartridges, than it is with cheaper ones; I can´t see that.