The costs of giving out whatever info is available are close to zero.
If you do not know when "normal service" will be resumed - say so. And if you do not know when you will know, say so.
My worst ever airline "customer service" experience was with East at Gatwick. We had checked in and were airside. With no info whatsoever, no announcements, no nothing, Easy cancelled the flight about 20 minutes before departure time.
Clearly Easy knew there were pax airside.
We were ignored by Easy and everyone employed by the airport.
Eventually, a small group of us persuaded Security that we should not be where we were. The Security people escorted us back to landside.
It took hours for us to be reunited with our luggage. No thanks to easy.
It would have cost them nothing to communicate with us. We are still waiting for their apology. Pigs might fly.