Yeah, the RCAs are shielded just fine. It's more that I'd like to hook a nice looking RCA up to them instead. But, black regular RCAs work fine. I have two, so, I could mod one to accept custom RCAs. But, won't make any sonic difference. Was thinking of keeping one original and modding the other a bit.
Nod. Mine were made in the 00's, but, I have friends have ones from the 80s and 90s and they work like new. The lights eventually burn out (mine haven't yet), that's about it hehe. And that's just an excuse to install a different color light hehe.
Like you said, the other advantage is availability of parts is high and TONS of information on them and helpful people.
The Wheels of Steel.

Maybe there is better, but, I have no doubt in my mind why these became historical. As far as usability, quality, ergonomics, maintainability, etc. etc. it's turntable heaven.
Oh! Another benefit: Can buy multiple headshells and swap cartridges really fast