Not storing personal information now removes a whole class of work you have to do. While you store personal information, you need to spend time keeping on top of security patches and issues. It means you need to worry about legal obligations.
If you just don't store it, you don't have to worry about that. You need to spend less time per month maintaining the project. If you're a volunteer project, you might not have the time available to keep on top of it.
Not storing personal information now removes a whole class of work you have to do. While you store personal information, you need to spend time keeping on top of security patches and issues. It means you need to worry about legal obligations.
If you just don't store it, you don't have to worry about that. You need to spend less time per month maintaining the project. If you're a volunteer project, you might not have the time available to keep on top of it.