SHM has a lot of limitations and like you, once I felt that I had enough protection inside my home, I started to look towards securing the outside of my home to hopefully catch things before there was a home intrusion and found that SHM was too restrictive.
Firstly, I made a distinction between outside events that were not intrusions and inside events that indicated an intrusion.
Secondly, I set up SHM to only include those items that indicated an intrusion, ( sensors and switches inside the house).
Thirdly, I use routines to arm/disarm the system. I use Custom Rules to control everything outside the house and notify me if there is any activity there. For example, I use motion detectors to fire my Arlo cameras early enough for them to record all the action, turn on inside lights if necessary, etc.
I hope that helps.