I enjoy diving occasionally. Dive lots can be very pretty to see and there are extra things to find and collect and do. But, I mostly don't bother. Probably next game I'll be diving constantly. I'll have a look at Ridgeview in Summer and see if I can get a dive lot into it. I've built plenty in other worlds by Rflong7. I've noticed that worlds with dive lots in them are not necessarily decorated and I've not been able to decorate them. This happens when the lot is placed and the world is saved without having saved it to the library without exiting the game, then shutting down the game and getting back into the world and deleting the lot and then placing the lot again from your library. This may not be possible to do when using Create a World. So I assume it is possible the undecorated lots in those worlds were placed and the world saved without completing the process needed to get them to work properly.
I haven't looked at Ridgeview in Summer. I'm using a lot of Rflong7 worlds in my various YouTube series. Sometimes I will add a dive lot if I have mermaids living in the world.