Hi,
Trello board is now public, sorry, I did not see it was only org visible.
As for downloading everything, this is not the spirit indeed ( but read on, I have a solution cooking). Many, including myself would complain instantly, because it increase the compilation time ( until Unity only compiles what's really needed...).
so, a granular, get what-you-need-only is definitly the way to go, typical example, the networking actions that is a problem on many platform because they are not part of the targeted platform. Or Action that are only for a given module, why host dozens of actions on a module you will not use, like the physics 2d, the Ui, Mecanim, pathfinding.
I haven't counted the number of custom actions, but I would bet it's way above the 1000's if not more including all the the third partys on the asset store providing PlayMaker support.
however, I hear you on the argument of "yeah... but I have to get the one I always need always and always and it's a pain".
YES

we all agree on this and that's true for regular packages outside PlayMaker too

To address this, I will create a user management system so you can log into the ecosystem and combine your own package of custom actions you will flag and it will create a single package you can access and install. Like a "favorite" tool allowing you to stock your preffered actions into packages.
I think this feature will require a small subscription fee, but I am not sure yet, like the ability to point to private github reps for teams working on sensitive work and wnat to benefit from the ecosystem. Your feedback on this ( what should be free, what could be charge a small monthly/yearly fee) is very much needed.
I think with this, it solves both types of use, either you get the one you need as you build your project, or you install that custom package of yours and you have everything ( everything you defined) in one go.
Bye,
Jean