Rather than just filling up existing rooms with turnips, or having a bland turnip room, they’re creating bespoke turnip storage areas that work with the theme.
So, it might be that having a dedicated room is your best option for turnip storage … unless Nintendo decides to patch a better solution.
All houses come with storage, which can be upgraded — but no matter what you do, turnips can’t go there.
Some players are making use of the island grounds to put away their investments.