Yes, all the paperwork of a Sparbuch certainly belongs to a different era.
However, I'd also like to add the period of notice to the discussion.
When talking about saving accounts today, we either talk about fixed-term deposits or day-to-day money. A Sparbuch is designed differently: It has no fixed term and you can always deposit money there. If you want to draw cash out, you can draw 2000 € per month. For higher amounts a 3 months notice applies.
Since a Sparbuch is less flexible than day-to-day money, you should expect higher interest rates. However, in practice their interest rates are also low: Maybe because a Sparbuch ais typically offered by branch banks - whereas online banks (with better conditions) typically offer day-to-day money and no Sparbuch.