To me that need should be satisfied by making macros which are made available for installation via the Add-ons Manager.
If it would be used for developers to add quality standalone commands to it the name makes sense. As this is in line with what Complete workbench was used for in the past. If users would use it to create custom workbench experience. By adding commands from other workbenches to it. Icon is suitable and as for the name. Complete could make sense. We can't know up front if one or another or something else will happen. We just know Complete workbench isn't used for what it was made for anymore. And users into customizing usually resolve in creating new workbench as they don't see Complete workbench in its current form as a viable option.
The problem with this approach is we don't stimulate quality and long term upstream contributions. That is we don't provide a natural transition from macro to quality upstream FreeCAD command. Developer being involved in FreeCAD community for a few years that has written a few macros/workbenches likely is capable of producing an upstream FreeCAD command that makes sense. Having a workbench to add such command to it therefore becomes necessity. Around 100 commands should i guess happen first in the following years. After likely things should be evaluated further.