Why?
Making this deliberately useless keyboard prevents it from ever being a primarily functional item. This allows you to treat the project entirely as a creative endeavor, and not end up falling down rabbit holes that might otherwise prevent you from completing or enjoying it.
Watch me!
Given that they ended up using a rectangular footprint, why not at least include some modifier keys.
"Just because you can doesn't mean you should".
What you're arguing is that people should spend their free time doing things they enjoy.
You're being highly judgemental about something that doesn't affect you in the slightest. Plus I'm sure you have plenty of interests that many of us would be like "what's the point?"