Why more? Why add an extra layers, more complexity? Why not just ban deposits? The rental contract already covers damages caused by tenants. And it's not like you pay a €2000 deposit, cause €10.000 worth of damage and not have to pay the additional €8000.

Maybe in the past, with cash payments and paper records. Deposits added a layer or security. But does that still hold true today? I'm sure landlords will disagree.

If the landlord believes the tenant left the property in a damaged state, they can enforce the contract. Upside is that it's not worth it to sue for trivial shit like nail holes or greasy stove vacuums. Now the tenants are always on the backfoot, spending money to get their own money back.