Someone will have to prove to me that a cutter head can cut a more complicated groove into vinyl than a modern cartridge can read, given they are normally cut at the same speed they are played. Have there been any definitive tests on that issue?The contact radius of a cutting stylus is several orders of magnitude smaller than the contact radius of even the finest playback stylus. Therefore, the cutting stylus can trace shorter wavelengths and finer modulations of amplitude than any playback stylus can follow.
You can't perform micro-surgery with a butter knife. ;-)