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Redditor finds heavy block of iron shavings inside cheap PSU, also appears to lack safety protections
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
To me this is the most important reason for building your own PC. If you don't care or don't want to research each part then sure, get a prebuilt. Otherwise, it's really nice to know what's in it and do your research on each piece so you know it's quality and will be supported.
Warranty is the biggest reason for a prebuilt. Anything goes wrong with it and you're not spending money on things to test and experiment with. You send it in, it comes back working.
You get warranty for parts too. Unless you meant warranty as a substitute for building know-how.
It's a convenience factor I think. Send the whole thing away and it comes back working. Opposed to having to find the faulting hardware and determining the type of fault and dealing with the vendor for that specific part in hopes that it's actually the issue.