You used to hear all kinds of horror stories about people who threw a SSD into their PS3 and found their whole system grinding to a halt within a year.
"Enough" is a relative term and is up to you to decide. The alternative is significantly less performant coupled with unpredictable reliability (outside of expensive enterprise options), but a higher overall lifetime.
People don't tend to want to have to actively maintain their old tech any more than they absolutely have to.
Though I do think that if one is using old tech, they should be aware of the pitfalls. There was a good run of the capacitor plague, for example. I avoid this equipment in general as I don't have soldering skills (but man oh man, I would love to have a working SE/30! People trying to sell repaired SE/30s on eBay for $1400USD!) to repair them. I know the VRM on my G4 Cube can potentially have issues, as can the power brick. Fortunately there are small batch available replacements should I need them.