1. Its not a SEIM...
2. The various "recommended" options are pretty conservative. They also used to say don't install the network driver. Also not a firewall... though I hope that might change one day.
3. Orbital is interesting when you have to start digging during an event, but can't put your hands on the box... Orbital is also a source for Device Insights, and Secure Endpoint Premier, where they go digging for you... It's OSQUERY, so if you're familiar with that, or Alienvault OTX and their scan endpoints feature... same thing underneath. Orbital is available on Windows 10 (1803 or later) / 11, Windows Server 2016 / 2019 / 2022,macOS 10.15 / 11 / 12,RedHat Enterprise Linux (and compatible distributions) 6.10 / 7 (7.2 or later) / 8,Ubuntu 18.04 / 20.04,Oracle Linux (UEK) 7 / 8,Debian 10 / 11