Busybox isn't a monolithic system you need to link applications 
against, nor does it force you to depend on it. It *can* be built as a 
single executable, as a conveniency for those who don't want to have 
dynamic libraries in their way. Busybox provides its own init, which is 
not systemd, and it does not force you to use it. You build your own 
Busybox implementing the apps you want and only them.

     I guess you didn't intend to introduce any confusion, but it might 
arise from your last sentence.

     Cheers.
                             Didier