To add onto this, and what I don't think people get when they suggest to be "casual" about island hopping, is the massive issue with "open plots" left after someone moves out.
Why couldn't they have let us choose when to put down a plot after someone moves out? Instead, we have 1-3 days of island hopping with the impending threat of someone you really dislike moving into your town, then not being able to see any more villagers on islands because they stop spawning.
I think a nice compromise would've been that islands worked like the campsite, where villagers always show up on the islands, so you don't feel pressured to wait for the tiny windows they give us when we have free space available. I would love to take my time with all of this.
And don't get me started on if you happen to be naively careless and let someone's voided villager occupy your plot with the "moved out" glitch.