The various Materials Brokers are a step in the right direction, however, the exponential rate of exchange makes them really useful only for small scale materials trading. Need one more Technetium, ok, it's not so bad to give up 2 or 3 other equal-grade materials for them, or even 6 or 12 lesser grade materials for that one unit.
But need 12 more for that Tech Broker unlock? Well, good luck with that.
Swimming in Specialized Legacy Firmware you can't really use, but need Datamined Wake Exceptions to get your FSD up to snuff? You won't be able to wet both sides of a piece of paper with what you have left/gain after a trading session.
On the subject of materials gathering in other games....
Let's look at a few:
Witcher 3 : Red Mutagens - these are dropped by a few creatures slain in battle with some measure of predictability. Collect enough of the little ones and Alchemy yourself the big one you really need.
Minecraft: Need diamonds? You know they're found from a height of 0 up to, well, you can control the spawn depth of things, so whatever it's set to.
Final Fantasy: Looking for Dark Matter? Certain creatures drop it, even if it's a low percentage drop, you at least know what to go after to get it.
This is a theme that carries on through many different games, but in those, you know where to look, what to look for, and even when it's a rare drop item, persistence pays off. Elite, however, veers far from this - Sure, you might know to look for Arsenic on certain planets, but where to start looking? How many Outcrops must you track down before you stumble on that one Messoderite (or w/e it's called) that pops out that 1 piece of Arsenic you now just need 11 more of?
This is where that part just a couple lines down from my post really shines - Sensor Filters.
Let us Ignore Outcrops, Piecious Cobble, and other sources of Dontwantium and focus on the things we need.