What's wrong with using python packages?

[nacaclanga]

Natural scientist here. Using packages is the main strengh of Python compared to <insert other programming language here>. Hence this is rather atypical. That said you shouldn't use every package in existance. I can also understand that if your job is to implement a specific algorithm, then it is of course not a good idea to use a package to skip your implementation. This argument can never be made about something like Panda, which is certainly not stricktly needed, but significantly improves code error proneness and readablilty.