Would it be bad practice?
No, it’s fine. Especially for people who self host. Use what you have available to you as best you can
Why would it be bad practice?
Depends on your use case. A gigabit connection and hard drives are fine for something like a personal media server or simple file storage but if you wanted to edit video or play games from the NAS, you might look into upgrading to SSDs and getting a faster connection to the PC
Why choose OpenBSD over FreeBSD? Any noticeable differences? I know it’s supposed to be a more security focused BSD but I hear it has fewer maintainers? The idea of a BSD appeals to me but the hardware compatibility holds me back. Just curious what your experience is like