Why is not recommended to have an Eclipse project folder as a Git repository?

Question

When sharing a project as git and trying to make the Eclipse project folder as the git repository, Eclipse says that it is not recommended to do so and that it should be outside the Eclipse workspace.

Why is that?

Answer 1

While I agree about keeping the repository outside the Eclipse workspace, and I would still make a git repo within an Eclipse project root directory (like in this answer).

Unless your program is composed of lots of little inter-dependent projects, I would limit one git repo to one Eclipse project.
A git repo is about recording the content of a tree structure, and if that tree represents one project, it is easier to manage, tag, branch, merge (as a coherent set of files).
If it represents multiple project, you are not sure anymore about what a tag like "1.0" represents for each of the projects in that Git repo.

Plus, I like to add the .project, .classpath and .settings to the Git repo (as "Does git exclude eclipse project files from a new repo by default?")