That is what he meant but I disagree with it being busy work. That's just gameplay for accomplishing a goal. My argument against finite probes is that it takes away from what people are trying to do, which is explore, by making them spend a few minutes doing something else entirely. If it looks like a grind and feels like a grind. It's a grind.
Not sure I agree something that takes you away is automatically grind. Grind is having to do a repetitive task, material gathering in any number is a grind.
Taking you away from what you're trying to do is breaking your "flow".
Adding material grind to build probes for me yeah is grind and does break the exploration flow but they're not the same thing.
Mechanics are possible that fit in with the flow of exploration, I agree material grind is not it, I know you disagree but for me scooping does.
The exploration mechanic (for full scanning) is currently :
=> Jump => Honk => Fly to body => DSS => Fly to body => DSS => ...
It will be :
=> Jump => Honk => FSS Telescope => Fly to body => Probe => Fly to body => Probe => ...
Scooping rings fits right into that, you do a fly by of a body, that's it it's part and parcel of what you were doing anyway.
It does not require a break from the flow, you do not have to go down to a planet, get out the SRV and muck around for 40 minutes doing a completely different task than what you were doing.