If we are considering modern advantages, then there is one area where the 6AS7G is far and away superior to most other tubes. It is ironic, considering that it was probably the biggest stumbling block to widespread adoption back in the day: cost!
I purchased the OPT for my 6AS7G amplifier project from Sowter in the UK today. The total cost was £250 or so with shipping.
I also managed to buy NOS JAN 6AS7G, in the ST envelope, for $10 a piece today. I bought 20. Assuming I have to replace the 6AS7G once every year or two, I'm looking at a 20 to 40 year supply of output tubes.
In order to secure a 20 to 40 year supply 'monoplate' RCA 2A3s, or Sylvania 2A3Ws, or Raytheon 2A3Hs, I would have to sell a kidney...
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