It's only meant to manage when syncthing is running and notify about running state. Native syncthing webui interface is good and I don't understand why some apps bother to implement their own.
Personnally, no matter if it's on my phone ot desktop, I only use webui. So on Android it's exactly what I need.

On android, imho, there is only 2 alternatives : marcus syncthing tray and syncthing fork.
I would say first one is too complex and don't have a good UI for phone.
Second one is now developed after original dev (catfriend) handed it's repo. Communication about this change has been quite obscure and circonstances are not clear, especially when new owner was without previous history. A lot of people think it's shaddy. It has been several months now and I don't know what's the consensus now!