There’s nothing wrong about talking about the sound of tubes, it’s something we enjoy doing, just as long as everyone knows that their results may vary. There are some posters on Audiogon who insist that there is no difference in sound between tubes or that new production tubes always sound better than vintage tubes, for example.
Many more people read threads than actively participate in the discussion. Many of them are people who do not have experience in the topic being discussed. So it’s always good to add the qualifier, IMHO.