First off, congratulations Frontier !

You gave explorers real hope again. Also, I'm part of the DW2 organisation team and our minds are very much aligned to making this a big success. Boiling with ideas already. And yes, the stream itself was presented in a very good and authentic manner, so commendations to all 3 of you !
There is something sensitive that I will have to comment on: the infinite amount of probes
Now I know you thought a lot about this, tried to find a formula with a certain amount that might work and at some point you went for a middle-ground solution by using a efficiency target. It is a smart idea in a way, but in another way it is a missed exploration opportunity. Because exploration like you now showed is awesome, but most experienced explorers that are not shy of going long distances do embrace synthesis as part of their journey: heat sinks, SRV fuel, SRV repairs, hull repair limpets, etc. And yet none of these like grinding.
So I feel this should be re-brainstormed a bit, because there is an
opportunity to include probe synthesis within the exploration experience. Keep the materials tier 1 or 2 and you have an incentive to explore planets more, since prospecting and shooting rocks is something you do at the same time as exploring ! Finding planet surface POIs is not a separate activity with your SRV, instead it is a combination of activities that form a whole. And it is not just for increasing the incentive at planet surveying and prospecting but also mining. Shooting and detonating asteroids, knowing that it will yield some cheap mats for your probes simply adds value to the experience.
So once you know collecting probe materials is part of an explorers journey as long as you keep the cap high (similar to what you did for other materials) and the cost low, then you know discarding synthesis completely for probes feels really off as it is inconsistent with other synthesis operations they do use as part of exploration. This is also why the grinding argument is biased and risks judging to quickly as it comes from a perspective of the past that does not think in the new mechanics and context of the explorers dream coming true.