I was thinking more along the line of a couple minutes of replay at most. An instant high fidelity replay feature buffered in memory with the option to save to disk. I guess Asobo needs to figure out how to record the weather first. That would also open up playing with ‘old’ / historic weather data.
But it can of course also only save the plane telemetry for much longer. Then you can enjoy watching the journey under different conditions.
I think most people simply want an instant landing replay like you had in FSX. The last x seconds to view the landing from different angles. Ignoring everything else that goes on around you, it should be straightforward, record telemetry and control surfaces. Yet maybe there are some snags with all the different planes and different controls making it not as straightforward.
How do third party replays do it? Do they somehow disable the flight computer, overriding auto thrust etc?