Um. Wrong. Most SE/30's that aren't recapped are no longer working or are exhibiting symptoms of cap leakage which corrodes the motherboard.
In fact I would suspect that most component failures in any electronic device are due to cap failures.
There's a very active community of people dedicated to replacing these ticking time bombs which tantalum caps which will never leak.
On the flip side, all my Amiga's which are even older than my SE/30's which use...