At a minimum a basic power up/down status. I plan on using something like this as a tertiary circuit, and only 'active' when primary/secondary go down. So if the MG21 was hard down, I wouldn't know about it until its too late.
I also know on my MX67C there is a cellular status, so I guess having that too would be nice, in case maybe the SIM fails or something like that. Just some overall alert if the devices or cell goes down, we want to know to take action etc.
But since I have your ear 😃
WAN2 alerting on any regular MX is a very much needed item, so I am channeling my inner strength like the good Kung-Fu Panda that I am towards your HQ.