I hate recasting characters, replacing narrators in the middle of an audiobook series, etc. It’s super jarring, and it feels bad even if the replacement does a really good job.

There have been cases where it’s been for the better, cases where someone died and there’s no way around it, etc, and cases where I still kind of wish they didn’t do it, but it works OK. But there should be an extremely strong preference to avoid doing so unless there’s actually no alternative.