Need help choosing modules for 32-channel lighting control with Home Assistant

[admin]

I’m still designing my setup and need a final bit of clarity.

Brain (planned): one Server16 running Home Assistant + MQTT.

Its 16 on-board relays will handle the first lighting circuits.

Expansion need: another 16–32 on/off relay outputs (and dry-contact inputs).

My question:

If all the automation logic, voice control, and MQTT broker will live on the future Server 16, can I attach a simple relay board that does nothing more than listen to MQTT commands and switch on/off
I really don’t understand why every relay-expansion board has to be so complex when my main Server 16 already handles all the logic.

This is why, at the start of the topic, I asked for a single video that explains all the KinCony modules, their types, and the overall system architecture. Unfortunately, KinCony’s YouTube channel contains many great videos, but each one focuses on a single module review and doesn’t provide a complete overview of which modules are required for a straightforward home-automation project.

Because we do not recommend using extended IO solution, such as extend by i2c relay or input board. Because this is not a stable way. Each KinCony controller can work independently, which is more reliable and flxible. if any board broken ,others also can work well.