As from my other replies, that's awesome - you're looking for a usage paradigm that is not what Arch is for; it requires attention and regular maintenance, and "keeping up" on a regular basis. You've hit the nail on the head with the followup sentence, you have to be willing to spend a day every now and then keeping up.
Arch is not for people who want to ignore their system and hope it all just keeps working, then update 700 packages all at once and have it come crashing down. There is an agreement (the social kind, not the legal kind) you enter into when using Arch that you actually engage with it on a regular basis because you like doing that and like to tinker. It's build for experienced Linux techs who like to engage on a regular basis with the plumbing.