Yikes, as a civil engineer I think your uncle was short-sighted
Nothing is worse then hearing the phrase 'obsolete technology', which is largely tossed about by marketing departs of new, often largely unproven, technology trying to gain market share over much more established competition.
Tube amps and preamps do a lot of things well. Yes, replacing tubes means ongoing hassles with sourcing as well as repeated costs, but these days many tubed components have self-biasing circuits or very user-friendly bias adjustments that make it easy to keep the component at its best.
The classic 'warm' tube sound has largely been improved upon over the last few decades, although there is still some gear out there that is made to sound that way because some people prefer it. And thankfully solid state has also tremendously improved, to the point where most gear no longer grates on your ears when listening.
It's probably easiest just to go to an hi-end audio shop and listen to some tubed systems yourself. When paired with complimentary speakers they make beautiful music. Low-efficiency speakers generally do not match well, although some tube configurations can put out a lot of power.
My system is a 'balance' of a solid state amp and a tubed preamp. The last iteration of my system was configured the same.
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