So you guys obviously don’t want everyone to buy houses justo to fill them with chests. Why not instead give us the option to upgrade our chests. You can have a small chest start with 10 slots, then upgrade that small chest to fit 20 items, upgrade 3 30 items and so on.
My suggestion would be to keep the chest with the same visual that way people will still decide to use small or medium chests to decorate their house with instead of buying only large chests.
You could make small chest upgrades give that chest 2 more slots per upgrade, medium chests 5 slots per upgrade and large chests 10 slots per upgrade.
This way people can still choose to decorate their houses with small and medium chests for an aesthetic reason, instead of convenience.