100% makes sense, it depends what you're looking for.
There are however lots of time-series that do change in Finance, e.g. valuations, estimates, alt-data (an obvious one is weather predictions). The time-travel feature can being super useful outside of external data changing as well, as an audit-log, and as a way to see how your all-time evaluations have changed (say backtests).
I’ve never seen it used for backtests personally. Generally backtested results are saved as a batch of variants following some naming convention as different symbols.
You would use some convention for naming and parametrising backtests, 'different' backtests would get stored separately. But once you start updating backtests, running them in a loop with changing data, that's when the time-travel feature starts to be useful.
There are however lots of time-series that do change in Finance, e.g. valuations, estimates, alt-data (an obvious one is weather predictions). The time-travel feature can being super useful outside of external data changing as well, as an audit-log, and as a way to see how your all-time evaluations have changed (say backtests).