"You don't have to know anything about engineering to understand this- its purely economic. If tubes were really inferior, they'd be gone, but the marketplace keeps them around."Not many major electronic products seem to use tubes anymore. Not even in this minuscule "audiophile" world. I would dare to say that, even as dependent on electronics as it is, an average Western world household does not have one single tube inside the house/apartment. What the heck, make it any world. It is pure economics, indeed.
Tubes may be surviving as a niche product for a few enthusiasts and that is who they are being made for. They have not died, despite them actually needing replacement quite often, because there is a market for them and that market is negligible when talking about economy. There are many products that survive because of people who cherish them for whatever reason despite significant flaws. Tubes are one of them.
I am all for tubes, but saying they are not an obsolete technology is a bit of over-optimistic stretch of imagination. Ask anyone younger than 40 about tubes. Chances are they will not have any idea what you are even talking about, much less have ever seen or used one.