Z-wave association groups and node limits

Hardware
1

Does anyone know why association groups are limited to 5 nodes/devices? I currently have some old Insteon switches that are “grouped” and some of them have 10 (and more) devices in them. Z-Wave is a much newer protocol, and I don’t understand why they put this seemingly stringent restriction in their definition.

Thoughts?

2

That limitation is set in firmware by the device manufacturer and can vary from device to device. Some only allow 1 or 3 per group.

3

So if you want to associate devices in greater numbers, you have to use a hub like HA to create automations to catch state changes and perform actions on the other devices?