As far as reinventing the wheel goes, this is something I am often accused of,

It wasn't really meant as an accusation - it's something to be aware of. The context in which it is done matters - for example, I like to use these replacements for Test::Fatal and Test::Warnings, because they're nice and short yet complete (for my purposes), and I don't pull in extra dependencies for such short snippets. Using it as a learning experience is also a valid point, I also like to learn as much as I can about the topic I'm working on. I just think it should be considered whether this is just a little "personal helper script", or code that is going into production, in which case a module will most likely have more features, and it will (hopefully) get updates. I think a good way to look at it is whether this code might be maintained by others (which is very often the case), and one can ask oneself whether this is code one would like to inherit from someone else and maintain :-)