I run a valve (tube) amp as my daily driver for audio and yeah, you do have to have a screw loose in this day and age. They're a lot better with modern passive components but modern valves are pretty hopeless in terms of longevity. For EL84s you basically have to buy old Soviet military stock (thank fuck Gosplan was so hilariously inefficient) or your amp will burn through them fairly quickly.

On the other hand if you look after them will probably outlive you. The valves are consumable components but the transformer is literally a big chunk of iron and copper, and they're dead simple to work on usually. Modern capacitors don't dry out and turn into resistors nearly as readily too.