No, nothing of the sorts.

As part of the team we all know, usually, the details of the projects we are working on, details that we cannot expect a manager to follow or know for each project, because there are a lot of details and many projects. A lot of them overlap in discovery, development, execution and deployment and also have different priorities.

And it is my understanding that managers also need to prioritize given sudden issues, emergency requests, and so on.

Anyways, with that info, we can decide who is the best fit for it given the experience they have had or not with specific projects.

Also it is usually not that hard.

You don’t get a backup 2 days before your time off, indeed, more often than not, it is asked with a lot of anticipation.

Also, most of the time when you go on time off, you are encouraged to have all of your projects deliverables ready for when you are out.

That way, your teammates doing the backup are just checking in on the project and available for general questions.

Personally, I like to leave documentation as well for my backups so they know what to expect. It’s not strange to have changes that imply more work for the backup so the extra context helps a lot.