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Ok true, but the culture of the time was to use as much negative feedback as would make the amplifier unstable, and then back it off a bit. Given this sort of treatment, beam power tubes formed the basis of high fidelity amps from the early 50s until the end of the tube era. Triodes were still around but no longer mainstream territory.
The triode revival of the 90s was another story. I do remember in the early 90s hifi world made a stereo amp with a 6080 (industrial 6AS7). There have been others too, and also the OTLs.
I run single ended 2A3 in one system, and push pull 807 in another. I like em both
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