How long until it's no longer a question on the screen but enforced vis software? This is the downside of OTA and permanently connected devices. It doesn't belong to you and features you purchased can be taken away from you.
That said, it's not like brown outs are optional. If it can prevent a general brownout it's probably a good thing.
Oh right, no CCS adapter in the US yet. So ChaDEmo at 50 kW at best.