Be nice to the new member, Green. 
Yep, looks like that’s correct. 1 node can support 244 SLC’s, although I don’t imagine too many systems get designed like that. The more distribution you have across a network, the less risk you create for a single point of failure. All of the major brands’ networked platforms can handle jobs of just about any size, but GW-FCI gives you some flexibility in being able to run a ton of devices off one node.
The Honeywell brands are really at the top of the game when it comes to addressable technology. Simplex and EST rely on technology that was revolutionary for the time, but is starting to get up there in age.