I read this letter in mounting disbelief. A socket is just a socket, so how it can affect performance is beyond me, unless it has been designed badly giving a loose connection. He also complains about going back 50 years, whilst quietly forgetting that DCC is moving things forward. He seems to be saying that the mere presence of these sockets prevents shuttle controllers, and brake simulation, and feedback controllers. I don't have DCC, and am unlikely to get it in the near future, but I can't stick my head in the sand and pretend that it isn't a huge step forward in the hobby!
Personally, I thought he was talking a load of crap about something he appears to know absolutely bugger-all about! I would be mildly interested to know which "magazines and internet letters" he was looking at that had a whole lot of other people like himself. What is an internet letter, anyway? Is this one?