I think probes could have still been synthesizable but cheap, and it would have been preferable to infinite. 1 Iron = 200 probes is something probably anyone could deal with, and it would have added a little more impact to their use, and more payoff for "getting good".
With respect; after a few dozen uses, there will be no more getting good. Good will have been gotten. So you're
still rewarding improvement with a negative gate that requires tokens. We have enough things that require stopping for tokens, adding more doesn't suddenly make it any better.
Other people have already said this, but I think the probes should use a little fuel with each one you launch. Maybe the materials themselves are handwaved as trivial, but hey we're launching an object within its own little Frame-Shift envelope so maybe it deploys the ship's drive capacities in some way.
So we're escalating materials use, and including fuel use. Collector limpets do not draw fuel?
Here's the other thing: the whole "efficiency" concept for mapping planets is neat, but doesn't make any sense in a world where probes are infinite. If they are a limitless non-resource then there's no such thing as efficiency. That's clearly an idea that is left over from Frontier's original vision for the idea before youtubers complained, and it doesn't really fit anymore.
Maybe just say "i don't like infinite" and just dispense with all the if-then-else supposition.
I'd like to see something other than infinite probes because it would make the whole activity more consequential if it were connected to other parts of the game.
In what way? After a few hundred uses, how is requiring materials suddenly making anything more consequential? It'll just encourage exactly the same thing that's also been whinged about; people honk-scoop-jumping because if you gate probe use considerably, then folks
simply will not use them. That's the outcome. You make them a chore, and thus irrelevant.
We already have a number of micro-management materials. Ship Fuel. SRV Fuel. Ship repair. SRV Repair. All of these require sourcing as it is. Adding yet another one, does not improve the skill or reward, any more than the prior do.