The Batfamily only becomes “nuanced” when it gets stretched thin to include any character with Bat association. The main Batfamily usually have their own books for a reason. Popularity matters. Stuffing a book with a bunch of characters people don’t really want or aren’t interested in, that book isn’t going to last very long. To try and sell the concept of a Batfamily team with fringe members and loose associates would just undermine the very concept of the Batfamily. Enough with the halfway home teams already. Further build on the foundation that made the Batfamily something of worth. Regardless if they might also have a solo. Having a solo shouldn’t be a punishment.
Even the main Batfamily is in awful shape right now. They can’t keep doing what they have been doing. They can’t keep forgetting about the ones they expect to carry a solo, throwing them to the wayside or undermining them for flavors of the month or characters not going anywhere. Cause all that made for is a bunch of gone nowhere Bat stamped peripheral characters and poorly produced Batfamily satellite books now in the gutter.