The poster is trying to avoid the possibility of their check luggage being detained due to the cord in it. Even if detected at security within the carryon, that delay is likely shorter than the delay in delivery of checked luggage.
You can play back the video of her arrival at this Youtube channel for a few hours today:
Screen grab as she approaches the site of the bridge collapse
Fixed.
The sailings on the GGG flier are usually always restricted to new bookings: from the flier "*Going, Going, Gone is valid for new individual bookings only. Offer is not combinable with any promotional offers or discounts with the exception of Shareholder Benefits"
That's ship specific and unknown. The examples in this thread are just that, but you can't assume the same thing will happen on your sailings. Unlikely any obvious work will happen after the dry dock.
Like this thread, that evolved into a social media one with myriads of topics. It is a record for the RCI section. Perhaps one day, the mods will have the courage to move it to the Floataway lounge.