In order to schedule in-situ measurements at the time of Sentinel-2 and Landsat-8 overpass for my AOI, I would like to access their future acquisitions plans for the summer 2020 (July/September).
I have read in this post that the list of all future acquisitions is difficult to predict. I would like to better understand why: if possible I would like to build a preliminary schedule just to have an idea, even if it's not 100% reliable.
So far I have the following sources of acquisition plans:
ESA publishes the Sentinel-2 acquisition plan, but its time coverage is only a couple of weeks
USG publishes a Landsat acquisition tool which seems to fit my needs (it displays overpasses up to 2022)
The Landsat Acquisition page explains that the acquisition plan is based upon seasonality, land definition, historical cloud cover, gain settings, and sun angle.
How come the Landsat-8 tool has such a long time coverage and the Sentinel-2 tool doesn't? Should I not trust the Landsat-8 tool? Are the acquisition plans of both satellites not subject to the same uncertainties?