To begin, Rudy van Gelder is not the first to have said this. The last sentence is basically a direct quote from Ken Kreisel (of M&K fame) who I remember said this in the late 80's.
Rudy indeed has a good point about LPs but doesn't expand (at least not in the quote) as to a major reasons why LP's are a flawed medium which are namely, that the equipment to reproduce what's in those grooves is a nightmare waiting to happen, plain and simple. To begin, the pivoted tonearm is a distortion producing device, period. This has been discussed ad nauseum and no need to repeat it here. It is simply a fact. Tracking angle error produces distortion. It's not voodoo. It's science. For that reason alone, a straight arm design is advantageous, but how many of us are using one of those? (which also have potential problems since execution is just as important as theoretical considerations). But it's much worse than that. For example, if you think that the VTA is perfect for all record weights (i.e. thickness) then we are just going to agree to disagree. To me, it's actually one of the best reasons to use 2 tonearms on a TT. Set each one for different record thicknesses (i.e. reg vs 180 gm vs 200 gm etc). (Why have only one distortion producing device when you can have two!)
What’s worse, even for records of identical thickness, depending on the cutting head that was used, the optimum VTA can vary from record label to record label and from record to record. Strike two. Want more? Let’s talk azimuth, which has to take into account VTA, tracking weight, and believing that every damn stylus was mounted to perfection as to have the stylus aligned exactly 90 degrees to the top of the cartridge. If you think this happens with 100% certainty, I wonder how you feel about the earth being flat or climate change? The list goes on. VTA is sensitive to such incremental increments that adjusting it with 200 micron thick playing cards is sheer lunacy. 10 microns makes a very real difference! Not a believer? Well, then tell me what system you are using for adjustment to refute this. Some tonearms allow this sort of precision adjustment. Once heard, it's hard to refute. (And also, unfortunately, it makes your audio life much more miserable.) Even more pathetic, once you hear the difference that 20 microns might make, you might have to choose among two options of which neither might not be "perfect" ( a meaningless word in this case). For example, one setting may make bass a bit more robust, but you might lose a bit of air on the strings. So what then is the "right" setting for musical truth? I'll tell you this. Whatever it is, it is probably going to change for the next record you play. Want more?
Let’s talk about anti-skate. I almost don’t know how I ‘m going to live without finally breaking down and getting a scope and looking at distortion using test signals although for now I’m doing it by ear using some well-trodden test records (Hi- Fi News, Cardas, etc) and music. But a part of me knows the sound is probably not perfect and even worse, probably changes across the single side of an LP. Another small imperfection in a very flawed system.
Keep in mind we’re not even going to talk about wow and flutter, bearing noise, warped records, out of round records and host of other trivial and not so trivial matters (i.e. racks, footers, etc) that can wreck havoc on this beloved relic of a reproduction medium.
Here’s the bottom line. The first take-away is that if you think your LP set-up is perfectly optimized, you’re probably 1) generally wrong and/or 2) possibly correct for at least 1 LP. But for all your LPs? Almost certainly not. Next take away. I understand why many folks, particularly those that have a superb server/DAC, often defer to that medium more and more for their daily music dose. Simply put, it's just flat out easier, and if it's done well, can be both highly enjoyable and the far less anxiety generating medium especially if you have the obsessional/ compulsive gene as some of us do
. Final take away. Yes, when there is perfect harmony in the universe and the stars line up just the right way and you say just the right incantation, you can achieve some magic with LP playback that may otherwise be elusive. But Jeez, what pain in the ass. Really.