It ultimately doesn't bother me because it's not a feature I'd really use unless it was more unique than what Island Paradise gave us.
An entire underwater world with a place Mermaids live, a tonne of sea life to catalogue, dangers from the deep and the ability for Sims to delve deeper with a submarine to find terrifying and unique species? Then of course I'd love it!
But I know that's not the kind of thing we'd get, so I'd prefer a bigger focus on island life than ocean life if it's just going to be diving, underwater photography and treasure hunting.
I do wish they added it anyway though so that those who wanted diving got something at least.
