Your home network is certainly less of a security risk due to both being a smaller target and (usually) needing to have fewer services available or ports open, so I would agree with you it’s acceptable for security to be more lax. Personally, I don’t find sudo to be less convenient than su; it’s even saved me from thoughtlessly running a dangerous command a time or two. Also, I try to keep my home network setup close to my work network until doing so gets in the way. If nothing else, this prevents me from getting used to a different way of doing things.

However, it’s your network. If you find that your way works better for you, by all means, configure your system in whatever way seems best to you!