I am cruising 5 times (6-14 days) a year, last several years all with RCI.
Last times menus changed was 7-8 years ago. I knew every day by heart.
Now there is some variation.
When you say minority what is your sample size?
The only clear downside is lobsters, but it is more connected to deficits/prices for this commodity. Lobsters are more expensive even where we live on average, and with huge losses RCI experienced over 2020 - 2022 they cannot afford to keep this item unlimited.
Yes, maybe they have a bit more time to clean each room and do each procedure better, but rooms are cleaned better in our experience.