Personally, whatever the filler is, it should be rewarding somehow.

If 123 is implemented and it doesn't interact with anything else in the kit, then I can see how it feels like mere busywork; it's how I feel about the current AST card system and the old one when you were skilled enough to fish for balance.

The filler should enable the killer. Merelt making the filler more complicated doesn't do much for me.