All informative posts. Thanks.
Maybe, in the future, such compact cultivators (with points/sweeps) too can be as popular as rotary tillers are now.
On the linked page (in the last post), it says:
"...S-tine cultivators ... prices start at $850 for a 2-row unit or $1,500 for a 4-row unit on a 6 foot toolbar..." If these prices are real, then, make your own compact cultivators at your home and, maybe, also sell them for good profit? They don't seem to be hard to make them anyway. Just a little welding and mounting two s-tines on a bar.