Why is there no examples of ICD for non-thread devices? (CON-1252)

[jansen44]

Reading Matter's Core Specification regarding ICD (short/long) I couldn't find anything specifying that it's only available for Thread connections, and also couldn't think of any reason why it's not possible to do so with WiFi only.

Is there any specific reason why ICD is only available for ESP's with Thread compatibility?

I need to know because we have a chip that is esp based (esp32-d0wdq6, Thread is not a project requirement and there are no plans to change the esp model) that we're adding Matter support. We could make it work, but since it operates on small batteries it needs to have some kind of mechanisms to help with low energy consumption - before Matter we were basically using deep_sleep with wake up cycles. I was hoping to achieve basically the same behavior but with Matter ICD.