Overall, the selected basic package of i3 spin makes it a lightweight installation, which I like. I understand the keyboard-driven workflow.
Compared to other methods of installation (ARM installer for server, Media Writer graphical installer), I had a hard time figuring out i3 installation and configuration. Arch wiki helped a little bit, but overall some packages/settings are not relevant to RPM or do not exist for Fedora i3 spin.
1. Functional features
nm-connection-editor: Anaconda shows a command-line tool to enter network setup, which is cumbersome for new users. I used nm-connection-editor to complete the wifi connection. It will be helpful to show two choices in Anaconda and Fedora docs.
i3 config wizard: it appears to be a useful 'shortcut' to configure, but once I create a config file (initially), it is of no use.
i3 debug mode: other than backup copies of config files, debug mode can be a safety feature for any failure. Often wrong editing of config files borks the computer and I had to reinstall all over again. Can we elaborate more on this debug mode in docs?
2. Visual appeal & user experience: this is a highly subjective and controvercial field, so there are no right defaults settings.
Display manager (greeter): Slick-greeter is better than stock greeter. However, there should be more greeters available like gtk2 in Arch.
i3-config-fedora: it installs xfce terminal2. I know people have love or hate relationship with urxvt. urxvt is listed as the default package, why does i3-config-fedora override urxvt with xfce? Rather, a few Fedora-themed color palettes for urxvt will help reach more people with ready-to-use features.
lightdm config: i3 spin has a separate config setter. I was unsure of what to do with this.
I would love to explore more on this topic and discuss it with SIG for collaboration.