Probably a good question but it certainly is becoming confused. Propulsion problems and electrical power outages are usually two different events. Happens all the time.
Now, that is understandable, with diesel electric being the primary energy of propulsion on every cruise ship today, that I know of; a power outage for propulsion rarely means a long term problem. But that doesn’t mean that electrical generation for the ship’s systems, amenities, etc. is impacted. Which likewise, doesn’t last long.
As far as the most worrisome, is the lack of propulsion? “My gosh, the ship is adrift in the middle of the ocean, floundering about.” Well, maybe, but rarely.
Guest reactions? True, some on board do panic for sure, if they know about it. Brings to mind the old adage, “When in trouble when in doubt run in circles scream and shout”.
I recall one time in the middle of the South China Sea during the middle of the day. I was reading my book on one of HAL’s upper decks when we stopped moving. No big deal as this happens from time to time, with us anyway. But as I sat there reading my book, with no propulsion for about 45 minutes, a staff officer walked by, I asked, “what is going on?” He responded, “What?” I said we have been dead in the water for going on an hour now. He looked around and said, “Wow!” Anyway, soon after the screws started turning and we resumed our great and uneventful voyage.