The advantage of hand-rolled loggers is they are easier, for one person, but more difficult for outsiders to get a grip on (compared to a standard solution, which should be well documented).

The question is - should other people modify the logging code? If it's just a part of your scaffolding, it might not be a huge issue.

It then becomes a trade-off between productivity, and technical debt. Prototypes don't need to be sustainable, they just need to be done. You'll either re-write them, or they will work forever (by some miracle) without maintenance, or most likely end up in the big bit bucket in /dev/null