An option to repeat a transaction on a recurring basis, like buying N-amount of stock every month at the market value, or paying a constant fee each quarter, or adding money to the account once a month.
For those who don’t import their transactions it allows to automate repetitive transactions.
But it’s biggest leverage is backtesting ideas, or preparing forecasts.
For backtesting, you can very quickly create a simulation of a long investing history.
For forecasting, you can generate complex future transactions that you will replace with the actual ones.
To make it more dynamic, it could be possible to use formulas - for example to calculate the fee as a percentage of value.